(CNN) - Once one of the world's most powerful travel documents, the might of the US passport has shriveled under the cloud of coronavirus, with doors slammed shut across the planet to American travelers.

With US coronavirus cases recently passing the three million mark, many nations now view America with trepidation. No matter how much they want those tourism dollars, they're unwilling to take the risk of opening their borders.

Even as restrictions ease up in some places, Americans are still on the danger list. Earlier this month, the European Union omitted the United States from its list of 15 countries whose tourists are permitted to visit.

While most US travelers are staying close to home this summer, preferring short-distance car trips to international air travel, some voyagers won't let a global pandemic curb their travel plans.

And there are still a handful of options.

Most of the Caribbean, for example, is open for US tourists. Other countries – including Mexico, Maldives and Turkey – aren't exactly welcoming US travelers with open arms (more like a temperature check and a Covid-19 test), but they are allowing visitors to cross their borders for the first time since coronavirus shut down much of the world.

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