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(CNN) — Once one of the world’s most powerful travel documents, the might of the US passport has been diminished during the pandemic. With US Covid-19 cases now beyond the 25 million mark, some nations continue to view American vacationers warily.

In the end, it’s up to you to decide whether travel to international destinations is a good idea. There are obvious health risks. Nations might change rules at any time. You may have to follow stricter curfews and mask mandates than Americans are used to. Violations could involve hefty fines and even jail time. The US Centers for Disease Control and Prevention and the US State Department provide Covid-19 risk assessments by country.

Also keep this important change in mind: Starting January 26, all air passengers aged two and older must show proof of a negative Covid-19 test that’s no more than 72 hours old to enter the United States. That includes US citizens returning from trips to other countries. Be sure to get information on testing sites in your destination for your return trip before you go. US embassies report some places are having trouble returning test results within the 72-hour window.

“Seriously reconsider going overseas right now,” acting Assistant Secretary of State for Consular Affairs Ian Brownlee told reporters on a call Tuesday. “US citizens who choose to go abroad, whether it’s for a holiday or a genuine emergency, everyone needs to be prepared to be potentially seriously disrupted in their trips.”

“If you cannot easily access a Covid-19 test, or if you test positive, you will end up overseas for much longer than you planned,” Brownlee added. “If that happens, you will be responsible for covering your own lodging and medical costs during that time.”

What follows is a list of countries, in alphabetical order, where it’s still possible for US passport holders to go for a vacation if they’re willing to take the risks:

Albania

Set on the Adriatic Sea, Albania remains open. The US Embassy website states that while there’s no Covid-19 test requirements or quarantine to enter, you can expect a health screening. Mask requirements and new curfews are in place.

Anguilla

UPDATE: This British territory in the Caribbean is accepting US visitors. You must be preapproved; click here to start the process and read up on extensive Covid-19 testing requirements, including the specific type of test you must get, as well as mandatory quarantine and insurance. The US Embassy warns test results might take longer than 72 hours to receive.

Antigua and Barbuda

UPDATE: US travelers 12 and older to Antigua and Barbuda arriving by air must present a negative Covid-19-RT-PCR (real time polymerase chain reaction) test result, using a nasopharyngeal or oropharyngeal swab. It must be taken within seven days of the flight, according to the country’s tourism website.

Visitors are subject to monitoring by health officials for 14 days and another Covid-19 test may be required, which could mean quarantining while waiting for the result. The US Embassy also warns that Covid-19 tests for the return are available, but not necessarily in the 72-hour window the United States now requires. Get additional US Embassy information here.

Aruba

Scroll down to the “Dutch Caribbean” entry below for information on Aruba and other islands in this group.

The Bahamas

Visitors 11 and older must have a negative Covid-19 PCR test result no more than five days old before arrival. Once you have the negative result, you can apply for a Bahamas Travel Health Visa here, where you must opt in for Covid-19 health insurance. You must also take a rapid test on day 5 unless you’re leaving. Get updates on the islands’ travel website and on the US Embassy website.

Bangladesh

US citizens may travel to this culturally rich South Asian nation. The US Embassy in Bangladesh says you must have a medical certificate with English translation stating you’re negative for Covid-19, with the test taken within 72 hours of travel. You must also “home quarantine” for 14 days even with a negative result.

Barbados

UPDATE: US citizens must complete an online form and submit it 24 hours before travel, the US Embassy says. You must present a valid negative Covid-19 PCR test result, taken within 72 hours of arrival. As the US is designated a high-risk country, you must still quarantine at an approved hotel or resort until you get a second test and negative result. You must also wear an electronic tracking bracelet. Test results might not be reliably available in the 72-hour window for your return. Find out more at the Visit Barbados website.

Belize

UPDATE: Known for diving and jungle wildlife, Belize is open to US citizens. To enter, you must download the Belize Health App and have a negative Covid-19 PCR test result taken within 96 hours of arrival or a rapid test within 48 hours of arrival. Or you can be tested upon arrival at a cost of $50. Get additional information from the Belize Tourism Board.

Bermuda

Bermuda requires each inbound passenger 10 and older to apply for travel authorization at the cost of $75 per adult and $30 for flight crew and children 9 and younger. Upon arrival, passengers must present a negative Covid-19 PCR test result taken no more than five days before departure. More tests are required on days 4, 8 and 14 of your visit. Read Bermuda’s extensive requirements here, including a traveler’s wristband rule.

Bolivia

This landlocked South American country allows US visitors who have a negative Covid-19 test taken within 10 days of a flight departing North America. Expect a health screening. No quarantines are in place. Check here for details.

Bosnia and Herzegovina

US citizens may enter Bosnia, known for cosmopolitan Sarajevo and gorgeous lakeswith a negative Covid-19 PCR test result that’s less than 48 hours old.

Botswana

UPDATE: US citizens can enter this safari favorite with a negative Covid-19 PCR test result taken no more than 72 hours before departure. If you fail to provide test results or show coronavirus symptoms, you will have to quarantine for 14 days at your own expense. Another test will be given on the 10th day. The US Embassy says test results are not readily available within 72 hours. For details, check here.

Brazil

Starting December 30, Brazil banned entry by land and sea (with a few exceptions) and put stricter measures on visitors by air, who must fill out a health declaration and present a negative Covid-19 PCR test result taken with 72 hours of boarding the flight. Read the embassy website for more details.

British Virgin Islands

US citizens need a travel certificate that you can get at the BVI Gateway website. You need a negative Covid-19 test result taken five days or less before travel to enter. You’ll also get another test on arrival and must quarantine four days while waiting for results. More information: US Embassy website | BVI government website.

Cambodia

If you want to go to Cambodia, the rules are quite stringent. You’ll have to pay a $2,000 deposit and you must possess a negative Covid-19 test result taken within 72 hours of arrival. You must also take two more Covid-19 tests — on arrival and on day 13 of a 14-day mandatory quarantine. You must also buy a $90 local health insurance package.

Chile

Chile recently opened to US citizens. You must fill out an “affidavit of travelers” form 48 hours or less before boarding, present a negative Covid-19 PCR test result taken within 72 hours of boarding your final flight and have proof of Covid-19 health insurance with $30,000 minimum coverage. Details: US Embassy in Chile Chile’s travel website

Colombia

All arriving passengers to Colombia should either have a negative result from a Covid-19 PCR test taken no more than 96 hours before departing; take a test upon arrival and quarantine waiting for a negative result; or quarantine for 14 days. Find out additional details on Colombia’s travel website.

Costa Rica

Costa Rica is allowing residents from all US states access. Visitors must complete a “health pass” form but are no longer required to take a Covid-19 PCR test. You must have proof of travel medical insurance, which you can get in Costa Rica. Get more details here from the US Embassy.

Côte d’Ivoire (Ivory Coast)

US citizens must have a negative Covid-19 PCR test result no more than seven days old before arrival. You must fill out a travel declaration form and pay the fee online. Learn more: US Embassy webpage.

Dominica

UPDATE: This eastern Caribbean island is open. All travelers to Dominica must present a negative Covid-19 PCR test result, recorded between 24 and 72 hours before arrival, and complete an electronic Immigration and Customs form via Dominica’s online portal 24 hours before traveling. US travelers should expect further testing and screening as it’s deemed a high-risk country. The US Embassy warns 72-hour test results are not readily available.

Dominican Republic

UPDATE: People traveling to the Dominican Republic no longer have to show a negative PCR Covid-19 test result on arrival. DR authorities will give breath tests to a small percentage of random passengers plus anyone showing symptoms. You must also fill out a health affidavit. The Dominican Republic Ministry of Tourism now offers free viral antigen testing to all international visitors staying in hotels. The US Embassy says PCR test results have been reliably available within 72 hours but could be affected by increased demand. More info: US Embassy in the DR.

Dubai

Scroll down our new entry on United Arab Emirates below.

Dutch Caribbean islands

Find out the important details on these various Dutch islands in the Caribbean by clicking on the links:

Aruba: All US visitors 15 and older must fill out a health assessment and have a negative Covid-19 test result. Aruba has eliminated its list of US states that require extra testing. JetBlue passengers can take an at-home, saliva-based test. Check the Aruba tourism site for all the specific health requirements.

Bonaire: You must transit through Curaçao (see below) and comply with a host of testing and quarantine protocols. Find out the details on Bonaire’s tourism website.

Curaçao: The island of Curaçao allows entry to US citizens from all 50 states. All visitors must present proof of a negative Covid-19 PCR test result taken within 72 hours of traveling. You must fill out a digital immigration card at dicardcuracao.com.

Saba: This unspoiled island has extensive entry requirements for US citizens, including getting government permission, a negative Covid-19 PCR test result (no more than 120 hours old) and 10 days of quarantine. Check the details here.

Get more US consulate information on all four by clicking here.

Ecuador

UPDATE: Ecuador requires US travelers to present proof of a negative Covid-19 PCR test taken within 10 days of arrival to avoid quarantine. Testing is available for those who don’t arrive with a negative result. You must quarantine at an approved facility while waiting for results. The US Embassy suggests you advise a lab that you need test results within 72 hours for your return flight to the US. The Galapagos Islands have additional entry requirements. Click for details on those.

Egypt

US travelers to Egypt need to present a negative PCR Covid-19 test result. Carefully read the US Embassy’s update on the timing of the test — to be safe, it should be no older than 72 hours before flight departure. Travelers must present paper copies; digital copies aren’t accepted. Children 5 and younger are exempt. You may be required to show proof of health insurance.

Ethiopia

Known for its surreal landscapes and ancient culture, Ethiopia requires arriving US citizens to have a medical certificate with a negative Covid-19 RT PCR test before boarding their flight that’s no more than 120 hours old. In addition, Ethiopia requires a seven-day quarantine.

French Polynesia

US travelers are welcome to the islands of Tahiti and Bora Bora. French Polynesia requires a negative Covid-19 test result within 72 hours of departure, to be presented before boarding. You will also be provided with a self-test kit to take on your fourth day. You must fill out an online ETIS form before you go. More info: US Embassy.

Ghana

A West African cultural jewel, Ghana is open to US travelers. You must have a negative Covid-19 PCR test result that’s 72 hours old or less. Arriving passengers then must take a second test that costs $150. There’s also a temperature screening.

Grenada

This Caribbean island is welcoming US visitors, but they must do the following: Present a negative Covid-19 PCR test result within 72 hours of departure; apply for travel authorization with the Ministry of Health; have a minimum seven-day reservation at an approved hotel for quarantine; and take a second test to be allowed to move about or remain at the hotel for the rest of the vacation. Details: Grenada’s Ministry of Health | US Embassy page.

Guatemala

All people 10 and older entering Guatemala by air and land must have a negative Covid-19 PCR test result taken 96 hours or less upon arrival. No quarantine. Travelers who have been to the UK or South Africa may be denied entry.

Honduras

Travel to Honduras is permitted with a negative result from a Covid-19 PCR or rapid test. You must also fill out an online precheck form. Travelers who have been to the UK or South Africa are restricted.

Ireland

US travelers are still allowed to visit Ireland, but recent restrictions on movement could make it a very limited vacation. A relatively new requirement: You must present a negative Covid-19 PCR test result taken within the previous 72 hours to enter; you can take a second test after five days. If it’s negative, restrictions are relaxed. Additional info: Irish government travel page.

Jamaica

Jamaica requires completion of an online travel authorization form and the possibility of being tested upon arrival. All passengers arriving from the United States 12 or older are required to upload negative Covid-19 test results to get travel authorization. The test date must be within less than 10 days of arrival. Read the website’s requirements closely; it has explicit instructions on taking tests and where you can go. More details: US Embassy in Jamaica.

Kenya

Home to the Maasai Mara National Reserve, Kenya is open to US travelers with a negative Covid-19 test result taken 96 hours or less upon arrival and who pass a strict health screening. No quarantine. Outgoing visitors must comply with the Trusted Travel initiative.

The Maldives

The Maldives has reopened to all international tourists. All arriving tourists age 1 or older must have a negative result for a PCR Covid-19 test taken within 96 hours of arrival. There is no mandatory quarantine. See the Maldives’ official tourism website for details.

Malta

Travelers wishing to sidestep the EU travel ban and who are willing to quarantine can visit Malta. Passengers who transit via a “safe corridor country” that allows US visitors may enter Malta after they’ve been in that country for 14 days. For example, US travelers can stay 14 days in Turkey and then be eligible to enter Malta. All passengers must fill out Public Health Travel Declaration and the Passenger Locator forms before departure.

Mexico

Though the land border between the United States and Mexico remains closed through at least February 21, US travelers can still fly to Mexico. No testing requirements are in place to enter Mexico, but the State Department lists numerous states to avoid because of crime. You can expect temperature checks and other screenings upon arrival. Again, remember you must have a negative Covid-19 test result to return to the US.

Morocco

This North Africa favorite is open to specific US travelers only. You must have reservations with a Moroccan hotel or travel agency or be invited by a Moroccan company, the US Embassy in Morocco says. A printed, negative Covid-19 PCR test result taken within 72 hours before departure is required to enter. Expect a health screening. No mandatory quarantines are in place, but local curfews are.

Namibia

UPDATE: US citizens can visit the desert nation of Namibia, which requires a negative Covid-19 PCR test result that’s not older than seven days. If the test is older than seven days, you’ll be tested and placed in quarantine at your own expense as you await the results. The US Embassy warns reliable testing in the 72-hour window for your return is not currently available.

Nicaragua

Home to volcanoes and beaches, Nicaragua is open. You must have a negative result from a Covid-19 PCR or serology test. No time frame is provided for how recent it must be.

North Macedonia

North Macedonia is open. No tests or quarantines are required, but airports conduct thermal screenings for all passengers.

Panama

A Covid-19 PCR or antigen test with a negative result, taken 48 hours or less before arrival time, is required to visit Panama. If the test results are older than 48 hours, you must take a rapid Covid-19 test at the airport. Read the government’s detailed requirements here. You must also fill out an online health affidavit. More information: US Embassy in Panama.

Peru

Travelers from the United States 12 and older may enter Peru for tourism with a negative Covid-19 test result less than 72 hours old. You must also fill out an affidavit of health. Peru reopened Machu Picchu on November 1. More details from the US Embassy here.

Rwanda

Visitors to Rwanda must present a negative Covid-19 PCR test result, taken within 120 hours of departure. They also must take a second test upon arrival, shelter in a hotel and receive their results within a day. The national parks are open, including primate tracking. To enter a park, you must have a negative test result less than 72 hours old. Additional info: US Embassy in Rwanda.

Senegal

Senegal, known for its beaches and music, is allowing US tourists to visit. To enter, all people 2 and older must present an original Covid-19 PCR test certificate with a negative result that was taken five days or less before arrival. There’s no quarantine.

Serbia

Serbia had been one of the easiest countries to visit with no testing requirements, but that changed on December 21. Now, US citizens need to provide a negative Covid-19 PCR test result taken within the previous 48 hours or a negative antigen test.

South Africa

UPDATE: One of the most popular destinations in Africa has reopened to US citizens. South Africa requires a negative Covid-19 PCR and/or serology test result taken within 72 hours of departure. Keep in mind a Covid-19 variant has been discovered in South Africa — check reports closely before you make plans. The US Embassy is getting reports of some PCR tests taking longer than 72 hours for the return flight.

South Korea

As of January 8, US visitors to South Korea must provide a negative Covid-19 PCR test result taken within 72 hours of departure. US travelers must also quarantine for 14 days upon arrival even with a negative test. You must also submit to health screenings.

Sri Lanka

NEW: The tropical island off India’s southeastern coast has opened back up to all nations. You must have a negative result from a Covid-19 test to enter and stay at least 14 days at an approved hotel or resort. Click on the CNN Travel article below for all the details. Also, find more information at Sri Lanka Tourism.

St. Barts

UPDATE: The island of St. Barts is open. Visitors 10 and older are required to show a negative Covid-19 PCR test result, taken within 72 hours of arrival. Antigen tests are not accepted to enter. Those staying longer than a week will need to pay about $150 for an additional test on their eighth day. The US Embassy warns that 72-hour PCR test results are not reliably available.

St. Kitts and Nevis

UPDATE: This Caribbean island federation reopened on October 31. You must fill out a Travel Authorization Form before arrival and upload a negative Covid-19 PCR test result taken 72 hours or less before you start your trip. You must stay on approved hotel property for your first seven days. You must take another test on day 7 of your visit if you’re staying longer. If it’s negative, you can move about on a limited basis. For stays of 14 days or longer, a third test is required. Seventy-two hour PCR test results are not reliably available. Additional information: US Embassy.

St. Lucia

UPDATE: US citizens 5 and older traveling to St. Lucia must provide a negative Covid-19 PCR test, taken within seven days of arrival. Visitors must also complete a travel registration form and arrive with a printed copy. You must have confirmed reservations at a Covid-certified property for the duration of the trip. Seventy-two hour PCR test results are not reliably available. Additional information: US Embassy.

St. Maarten

UPDATE: As of January 11, US travelers to St. Maarten must fill out a mandatory health authorization application. You must also have a negative result from a PCR test for Covid-19. It must be 120 hours old or less. Covid-19 health insurance is mandatory. Be sure to read the website for very detailed instructions on what type of testing is allowed. Seventy-two hour PCR test results are not reliably available. Additional information: US Embassy.

St. Vincent and the Grenadines

UPDATE: US travelers to St. Vincent and the Grenadines must have a negative Covid-19 PCR test result taken 72 hours or less before arrival. You’ll be retested upon arrival. As the United States is considered a high-risk country, a quarantine of 10 days and additional testing is mandatory. You must also fill out a prearrival form. You can get official Covid-19 protocol documents here. Seventy-two hour PCR test results are not reliably available. Additional information: US Embassy.

Tanzania

A favorite for safaris and beaches, Tanzania is open to tourists. Incoming passengers are required to fill out a health surveillance form and have a health screening. You might also have to take a Covid-19 test if the airline you’re flying with requires it.

Turkey

Turkey has started requiring that US citizens and all other visitors must have a negative Covid-19 test result taken 72 hours or less before their flight to enter. Previously, Turkey did not require a test. This will be in effect until March 1. Passengers must fill out an information form and prepare to be checked for coronavirus symptoms.

Turks and Caicos

Visitors to the Turks and Caicos must fill out a travel authorization form and provide a negative Covid-19 test result taken within five days of arrival. Children 9 and younger are exempt. Travelers must complete an online health questionnaire and carry travel medical insurance to cover any Covid-19-related costs.

Uganda

This lush nation in Central Africa is open to US tourists who have a negative Covid-19 test result taken no more than 120 hours before departure. Read more here.

United Arab Emirates

The UAE has recently relaxed entry requirements. Tourist visas for US citizens are being issued at the Abu Dhabi and Dubai airports. Travelers 12 and older must present a negative Covid-19 PCR test result within 96 hours of departure. Even with a negative test, you might still need to quarantine (depending on the emirate) and take a follow-up test. Check here for updates and details.

United Kingdom

Technically, US travelers may still travel to the United Kingdom. But travel for leisure is being highly discouraged because of the new coronavirus variant. You should closely follow news reports and watch for updates on the US Embassy link here before making any plans. If you still choose to go, you must have a negative Covid-19 test result taken 72 hours before departure to enter and quarantine for 10 days. Also note that rules may vary between England, Scotland, Wales and Northern Ireland. Click this link for more details on this rapidly changing situation.

Zambia

UPDATE: Known for Victoria Falls and wildlife, Zambia is allowing all international travelers to enter. You’ll need a negative Covid-19 test result taken at least 14 days before arrival. There’s also a mandatory 14-day quarantine. The US Embassy has not posted information on the speed of test results for your return to the US.

Recently removed from the list

The following countries had been allowing US citizens to enter but are closed again or removed by CNN Travel for other reasons: Montenegro (conflicting information from the US Embassy and the Montenegro government on entry requirements) | Croatia (no Americans allowed to enter until at least January 30) | Belarus (because of mass protests)