I have seen the coolest building designs is Dancing House in Prague. It's an externally amazing building for me, it looks like someone is dancing. Although it is a static building, you can feel its movement when you look at it. And on the top floor, it has a restaurant, Also, you can see the whole Prague’s city view. When I traveled there, I didn’t have not much money, So I didn’t go to the restaurant on the top floor. Just took a picture in the front of the building. If you travel to Prague, don't miss this place.