For those who are ready to dust off their passports (I’m not yet), the developers from Singapore’s MIT Senseable City Lab developed Escape, a price-driven flight-search engine. Now they’ve created something else as a result of pivoting during the global pandemic from, “Where can I afford to go?” to “Where am I ALLOWED to go?”
You can find the tool here, Covid Controls Tool:
https://covidcontrols.co/tourist-entry
The interactive map lets you plug in your country of origin to find the countries you can visit, and what (e.g., proof of a negative Covid-19 test) is required to do so.
If you start with the U.S., for example, you’ll discover a map disappointingly showing in red only 14 countries (not including USA) as of 9/22/20 and territories fully open to visitors from the U.S.