A quite nice place to visit in the European summer:
Krakow, Poland
Photo credit: DimaLiss@Pixabay, free use
One of Central Eastern Europe's most beautiful and historic cities, Krakow has also some places to spend your Bitcoin: at least one place to lodge and some shops and eateries. The central area with a biq square and the famous underground bars are a must see. Another interesting place is the historic Kazimierz neighborhood, where some of the Bitcoin-accepting restaurants are located. In addition the Tatra mountainous range is quite close, and if you want to see the horrors humans are capable of and learn from it, you can visit
Oswiecim, also known as Auschwitz. The BTCmap location is
here.
I was almost about to include Warsaw also in this post, but the city has no accomodation I could find which accepts Bitcoin.