Editor's Note — CNN Travel updates this article periodically. It was last updated in its entirety on July 5. CNN Travel updates this article periodically. It was last updated in its entirety on July 19.
(CNN) — US passport holders have more international travel options now than at any point during the Covid-19 pandemic. Total US cases have passed the 34.1 million mark since the pandemic started. After a promising spring and early summer of declining cases, new dark clouds appear on the horizon. The Delta variant grows more concerning by the day. Some nations, such as Indonesia, are overwhelmed by Covid. And the vaccination rate lags significantly in some US states, creating pockets of surging cases.
Still, more of Europe has been opening up this summer to US leisure travelers, especially the fully vaccinated. And soon Canada will join the list.
In the end, it's up to you to decide whether travel to international destinations is a good idea. The health risks are obvious if you're not fully vaccinated. Nations might change their rules at any time. You may have to adhere to strict curfews and mask mandates. Violations could involve big fines and even jail time. If you want expert input into your decision, the US State Department and the Centers of Disease Control and Prevention provide Covid-19 risk assessments by country. Both agencies rate many of the countries open to US travelers at Level 4, the highest risk for Covid-19. Also, remember that all air passengers 2 and older must show proof of a negative Covid-19 test that's no more than three days old to enter the United States.
List of nations
What follows is an alphabetical list of countries and territories where it's still possible for US passport holders to go for a vacation. Click the links at the end of each destination for important information on:
-- Presenting negative results from Covid-19 tests to enter (including time limits to take the test, types of tests allowed and additional tests upon arrival).
-- Quarantines (if any) and health screenings.
-- Possible exemptions from the rules for the fully vaccinated, people recovered from a recent case of Covid-19 or children.
-- Health insurance requirements, curfews and lockdowns.
-- Different rules if you're arriving from a third country vs. the United States.
These are all things you need to research before you book your trip. People testing positive for Covid-19 upon arrival or while visiting can expect to go into quarantine. Rules for land entry may be different.
Blessed with a gorgeous Adriatic Sea coastline, this southeastern European country has no test requirements or quarantine. US Embassy.
Antigua and Barbuda
Stroll along Turners Beach on Antigua's southwest coast.
Scroll down to the Dutch Caribbean entry below for information on Aruba and other islands in this group.
UPDATE: US citizens can now visit this Alpine nation renowned for its culture and food. Testing required to enter unless fully vaccinated or proof of past infection. Quarantine depends on your country of departure and vaccination status. US Embassy | Austria Entry Requirements.
On offer: beaches, interesting architecture and cultural experiences. Testing and quarantine requirements are in place. US Embassy.
San Pedro is Ambergris Caye's largest town. It's known for its laid-back vibe and excellent Belizean cuisine.
English is spoken in this Central American nation filled with wildlife spotting opportunities and stunning barrier reefs. Testing required; fully vaccinated exempt. No quarantine in place. US Embassy | Belize Tourism Board.
This landlocked South American country offers surreal landscapes from Andean to jungle. Testing and quarantine requirements in place. US Embassy.
Bosnia and Herzegovina
Bosnia and Herzegovina features cosmopolitan Sarajevo and gorgeous lakes. Testing required with exemptions for fully vaccinated or recovered from Covid. No quarantine in place. US Embassy | Bosnia Border Police
Botswana is renowned for its safari opportunities. Elephants are always a top sighting on any excursion.
This southern African nation is famed for its wildlife in the Okavango Delta and elsewhere. Testing required; quarantine is not. US Embassy.
South America's largest country has the lure of Rio's party atmosphere and the Amazon River's mystique. It also has a very high daily number of Covid-19 cases. Testing required; quarantines are not. US Embassy | Health declaration.
British Virgin Islands
Historic towns and natural landscapes are Bulgaria's calling cards. Testing required; exemptions for fully vaccinated or recovered from Covid-19 infection. No quarantine. US Embassy.
NEW: Canada has announced it will open itself up to US travelers starting August 9. CNN news story.
Côte d'Ivoire (Ivory Coast)
Côte d'Ivoire is a popular destination for people wanting to enjoy West African culture and food. Testing required; quarantine encouraged but not required. US Embassy | Travel declaration and fee.
Croatia, the jewel of the Adriatic, is once again open to US leisure travelers. Testing required to enter; exemptions for the fully vaccinated or recovered from Covid-19 infection. No standard quarantine in place. US Embassy | Croatia official entry form.
Both parts of this politically divided Mediterranean island are open to US tourists. The Republic of Cyprus and the northern third of the island administered by Turkish Cypriots (Turkish Republic of Northern Cyprus) each have their own rules of entry and testing. US Embassy in Nicosia | Visit Cyprus.
Prague's timeless charm makes it one of Central Europe's most popular destinations.
Sean Gallup/Getty Images
Often at the top of "happiest countries" lists, Denmark now accepts US travelers. Testing required; exemption for fully vaccinated. Quarantine is not required. Different rules for Greenland and Faroe Islands. US Embassy | Denmark tourist information.
Scroll down to the United Arab Emirates entry below.
Dutch Caribbean islands
Find out the important details on these various Dutch islands in the Caribbean -- renowned for their hospitality and ocean life -- by clicking on the links:
Saba: Known more for its rugged landscape and hiking than beaches, little Saba is open. Testing required. Quarantine in place; exemption for fully vaccinated. Saba Tourism | Saba EHAS application.
The animals of the Galapogos Islands, part of Ecuardor, fascinate scientists and tourists alike.
PABLO COZZAGLIO/AFP via Getty Images
This Andean country at the equator also owns the Galápagos Islands in the Pacific. Testing required; fully vaccinated exempted. Quarantine required in some circumstances. US Embassy.
The Nile River nation has been attracting people to see its wonders since antiquity. Testing required; quarantine is not. US Embassy.
Ethiopia has a unique and ancient culture and rugged, otherworldly landscapes. Testing and quarantine requirements are in place. Before you travel there, closely monitor news reports about violence in the northern Tigray region on the border with Eritrea. US Embassy.
Georgia is a geographical and cultural crossroads at the Caucasus Mountains. Testing required unless you're fully vaccinated. No self-isolation for the unvaccinated under certain conditions. US Embassy | Georgian Ministry of Foreign Affairs.
Frankfurt, a financial and modern powerhouse of Germany, also has plenty of Old World charm, making it the perfect city for travelers who want a little bit of everything.
Boris Roessler/AFP/Getty Images
From edgy Berlin to picturesque Bavaria, Germany is now open. Testing required; exemption for fully vaccinated or recovered from Covid. Quarantine depends on vaccination status and nation from which you've arrived. US Embassy | German Missions in the US
This West African cultural jewel offers historical sites, delicious food and surfing. Testing required. No quarantine. US Embassy.
Greece, with its many ancient ruins and islands, is now open to US travelers. Testing required; exception for the fully vaccinated. No quarantine. US Embassy | Passenger locator form.
This Central American country offers historical sites and stunning volcano landscapes. Testing required; exceptions for the fully vaccinated or those fully recovered from Covid-19. No quarantine. US Embassy | Online health pass.
Honduras has epic diving off Roatan Island and other locations. Testing required; fully vaccinated travelers are exempt. Conditional quarantine in some circumstances. US Embassy | Online precheck form.
Geysers, glaciers, hot springs and waterfalls await in Iceland. You must be fully vaccinated or have proof of recovery from Covid-19 to enter. Testing and quarantine requirements in place as well. US Embassy | Iceland travel registration.
Great Blasket Island is a hiker's paradise -- and the donkeys seem to like it, too.
Courtesy Tourism Ireland
UPDATE: From ancient Jerusalem to modern Tel Aviv, Israel now allows US tourists. Testing required. Quarantine in place; possible exemptions for the fully vaccinated or those recovered from a case of Covid-19. Keep a close watch on developments regarding the recent conflict between Israel and Gaza. US Embassy | Israel Ministry of Health.
A visit to Jordan's ancient city of Petra is a travel highlight not only of the Arab nation but of the entire world.
KHALIL MAZRAAWI/afp/AFP via Getty Images
Home to the amazing ruins of Petra, Dead Sea coastline and the dazzling landscape of the Wadi Rum, Jordan is open to US vacationers. Testing required; quarantine is not. US Embassy.
Latvia -- with a walkable capital city, Art Nouveau architecture and surprising wildlife -- is open. Testing required; quarantine is not. US Embassy.
This tiny nation is open. Scroll to Switzerland below for details.
This Baltic nation is made for history buffs and is open to fully vaccinated Americans only. No testing or quarantine. US Embassy.
US citizens can visit. Testing required to enter; exemptions for fully vaccinated or proof of Covid recovery. No quarantine in place. US Embassy.
The land border between the US and Mexico remains closed through at least July 21, but US travelers can still fly there. No testing or quarantine requirements are in place. The US State Department lists numerous states to avoid because of crime. US Embassy.
UPDATE: US jet-setters can visit the Mediterranean city-state if they are fully vaccinated. No testing required. Embassy of Monaco.
UPDATE: This North African favorite is open to US travelers. Testing required unless fully vaccinated; no quarantines in place. US Embassy | Visit Morocco.
US citizens can visit this southern African desert nation that appeals to adventure travelers. Testing required; quarantine is not. US Embassy.
US travelers can visit the landlocked Himalayan nation. Testing required; fully vaccinated exempt. Quarantine requirements in place, regardless of vaccination status. US Embassy.
US travelers can now visit Amsterdam and the rest of the Netherlands. No testing or quarantine is required as the US is deemed a safe country US Embassy | Government of Netherlands
The Cathedral of Granada is a popular site.
Home to historical sites such as Granada and tropical beaches, Nicaragua is open. Testing required; quarantines are not. US Embassy | Avianca Airlines.
North Macedonia has a part Balkan, part Mediterranean feel and its natural wonders are relatively unknown. No testing or quarantine required. US Embassy | TAV Macedonia.
US passport holders can now see Krakow and Poland's other wonders. No testing is required, but quarantine is. US Embassy.
US travelers now have a travel window to get their Lisbon fix.
Courtesy Jessica Yubas
UPDATE: Portugal is currently open to US citizens. Testing is required; quarantine is a possibility. US Embassy | Visit Portugal.
UPDATE: Romania offers mystique, wooded and mountainous landscapes and lots of history. No testing required. Quarantine in place with exceptions. US Embassy | Romanian Embassy.
Rwanda's green hills and mountains are home to rare gorillas. Testing and quarantine requirements are in place. US Embassy | Visit Rwanda.
You can take a fishing trip in Senegal's mangroved-lined creeks and waterways.
Senegal, known for its West African beaches and music, welcomes US tourists. Testing is required; no quarantine in place. US Embassy | Entry form.
Serbia is steeped in historical sites and dramatic Eastern European scenery. Testing is required but quarantines are not. US Embassy.
This European nation of gorgeous lakes is open only to the fully vaccinated or those recovered from Covid-19. No testing or quarantine required. US Embassy.
With superb national parks, wineries and the allure of Cape Town, one of the most popular destinations in Africa is open. Testing is required; quarantine is not. Be aware some nations aren't allowing entry to tourists who have recently been to South Africa. US Embassy.
From busy Seoul to relaxing Jeju Island, South Korea is open. Testing and quarantine requirements are in place. US Embassy | Self-diagnosis app
After an extended closure, this French island is open again. Testing required; fully vaccinated exempt from quarantine. St. Barts entry protocols
St. Kitts and Nevis
Home of the steep and towering Pitons, waterfalls and volcanic beaches, the independent Caribbean nation of St. Lucia is open. Testing required. Quarantine for nonvaccinated travelers outside Caribbean travel bubble. US Embassy | St. Lucia travel website.
St. Vincent and the Grenadines
The country's famed Alps are once again open to Americans. Testing required with exemptions for the fully vaccinated or those recovered from Covid-19. No quarantine. US Embassy | Swiss Travel Check.
Kilimanjaro's glaciers could become a thing of the past as average global temperatures rise.
Sergey Pesterev/Flickr Open/Getty Images/Flickr Open
A favorite for big-game safaris, Indian Ocean beaches and Mount Kilimanjaro, Tanzania is open. Testing required; quarantine is not. US Embassy | Health surveillance form.
Tunisia offers ancient ruins, desert scenery and sunny Mediterranean beaches. Testing and quarantine requirements in place. Exemptions for the fully vaccinated have been suspended. US Embassy | Online questionnaire.
From cosmopolitan Istanbul to rural coastal escapes, Turkey is open. Testing is required; quarantine is not. US Embassy | Form for entry.
Turks and Caicos
This lush nation in Central Africa offers gorilla trekking, Nile River rafting and beautiful lakes. Testing required; quarantine is not. US Embassy.
United Arab Emirates
Jumeirah Beach is a popular gathering spot in Dubai.
GIUSEPPE CACACE/AFP via Getty Images
The UAE, with its glittering towers and luxury resorts, has emerged as a major world destination in the 21st century. Testing required. Quarantine protocols depend on the emirate. US Embassy.
Leisure travel to the UK is open. Testing and quarantine requirements are in place. Rules may vary between England, Scotland, Wales and Northern Ireland. US Embassy | UK government | Declaration form.
Known for Victoria Falls and wildlife, Zambia is allowing visitors. Testing and quarantine requirements are in place. US Embassy.
Recently removed from the open list
The following countries had been allowing US citizens to enter but have closed again or were removed by CNN Travel for other reasons:
-- Cambodia: The US Embassy reports the Southeast Asian nation has stopped issuing tourist visas; you can still apply for business-linked visas.
-- Chile: It has closed its borders to almost all tourists through July 25.
-- Sri Lanka: CNN awaits further information before returning this nation to the open list.
This is a curated list and not a full listing. CNN Travel has omitted certain open countries if they had very limited numbers of US travelers before the pandemic; have ongoing or recent armed conflicts, terrorism or rampant crime and unrest; or have entry requirements so extensive and complicated that they put the country out of reach of almost all US citizens. However, you can click here to check for the status and entry requirements of any country or territory in the world you wish to visit.