Prague, a jewel in the middle of Europe.
The city of Prague is already 2200 years old. The oldest building is the Praszký Hrad on the hill next to the old city center. It is both UNESCO World Heritage and in the Guiness Book of Records for being the biggest castle in the world.
Prague is a nice city to visit. Public transportation is good, so you can stay in the more relaxed city parts outside the city center.