Portugal is the latest European country to open its borders to U.S. travelers.

The country announced Tuesday that tourists from the U.S. would be permitted to enter the country, as long as they provide proof of a negative COVID-19 test. 

Travelers 2 years and older must take a nucleic acid amplification test – such as a PCR test – within the last 72 hours before boarding, or a rapid antigen test within 24 hours of boarding. 

Various COVID-19 restrictions are still in various places across Portugal. Masks are required at beaches while entering and moving around, and visitors must keep at least 1.5 meters (around 5 feet) between their towels while lounging. Social distance measures and masks are also enforced in closed public spaces, and masks are mandatory when social distancing is not possible, according to the U.S. Embassy and Consulate in Portugal. 

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United Airlines is the first U.S. carrier to resume flights to Portugal this summer, according to a statement from the company. Daily flights from New York and Newark, New Jersey will begin July 1. 

Israel will start allowing tourists who are vaccinated against the coronavirus into the country next month. 

Earlier this week, the country announced that starting on May 23, Israel will allow tour groups who are all vaccinated to visit. 

Groups of tourists will be allowed into Israel first because they will be “easier to monitor,” according to a translated announcement from Israel’s health and tourism ministers. 

The country is expected to allow individual tourists who are vaccinated into the country as early as July, Travel and Leisure reported. 

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Tourists will still be required to take a PCR test before flying to Israel, as well as PCR and antibody tests when they arrive at Israel’s Ben Gurion Airport — until officials develop a vaccine passport, which will eliminate the antibody tests, the announcement said.

Israel will start allowing vaccinated tourist groups to visit the country on May 23. Individual travelers who are fully vaccinated could be allowed to visit the country as early as July. (iStock)

Israel will start allowing vaccinated tourist groups to visit the country on May 23. Individual travelers who are fully vaccinated could be allowed to visit the country as early as July. (iStock)

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“We have been working to develop a plan that allows not only for the country to reopen to visitors, but also to ensure that everyone stays safe,” Eyal Carlin, Israel’s tourism commissioner to North America, told Travel and Leisure. “We have come so far, and it is for this reason we are adapting this proactive strategy of having a phased opening.”

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In January, Israel began requiring all travelers to the country over the age of 2 to get a negative PCR test within 72 hours of take-off, according to the U.S. Embassy in Israel. Travelers are also required to quarantine for 10 days with two tests, or 14 days without tests.

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Not only is Israel preparing to allow tourists into the country, it is also preparing to begin cruising again.

In March, Royal Caribbean announced that it would offer “fully vaccinated” cruises departing from Israel in May. 

The cruise line’s new ship, Odyssey of the Seas, will depart from Haifa for three to seven-night tours of the Greek Isles and Cyprus.

By Forrest Brown and Brekke Fletcher | CNN

Editor’s note: CNN Travel updates this article periodically. It was last updated in its entirety on April 3. The entry on Thailand was added on April 8. The US State Department advises that travelers consult country-specific travel advisories via their website or consult the CDC’s latest guidance. Before you make any international travel plans, check these sites thoroughly.

Once one of the world’s most powerful travel documents, the might of the United States passport has been diminished during the pandemic. With US Covid-19 cases nearing the 31 million mark, some nations continue to view vacationers warily.

In the end, it’s up to you to decide whether travel to international destinations is a good idea. The health risks are obvious. Nations might change their rules at any time. You may have to adhere to stricter curfews and mask mandates than Americans are used to following. Violations could involve big fines and even jail time.

If you want expert input into your decision, the US State Department and the US Centers for Disease Control and Prevention provide Covid-19 risk assessments by country. The CDC rates many of the countries open to US travelers at Level 4, at the highest risk for Covid-19.

Also, keep this in mind: All air passengers 2 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. Meanwhile, new CDC guidance says fully vaccinated people can travel at low risk to themselves but still recommends against it because of rising numbers of coronavirus cases.

What follows is an alphabetical list of countries and territories where it’s still possible for US passport holders to go for a vacation:

Albania

Set on the Adriatic Sea, Albania remains open. While there’s no Covid-19 test requirements or quarantine to enter, you can expect a health screening. More info: US Embassy.

Anguilla

This British territory in the Caribbean is accepting US visitors. You must be approved first. 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 quarantines and insurance. More details: The US Embassy.

Antigua and Barbuda

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.

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. More info: US Embassy | Antigua and Barbuda government website.

Armenia

From the historical capital of Yerevan to wild national parks, Armenia is open to US tourists. Armenia was in a brief war last year with neighboring Azerbaijan, but a peace treaty was signed in November. To