The rules are changing around what Americans need to travel to the European Union, including to some of the cheapest countries to visit, but it's been a moving target on a planned update, and the exact timing of when it goes into effect is still up in the air.
Once in effect, Americans will need to apply for approval under the European Travel Information and Authorization System (ETIAS). You will apply online, and the authorization, which will be linked to your passport, will account for short-term stays, including up to 90 days in a 180-day period.
