I remember a night in the curvy building on pic #7, the Czech claim that this thing is the biggest nightclub in Europe, I may believe it since it's a kind of empty building with concrete furniture and here and there some drunk czechs.
When the mood at one floor is too apathic, you can change floor and meet some other drunk czechs. Dunnow if it s a place to dance, but it s definitely a place to drink cheap beer.
Another one :
Saint. Frantiska Serafinskeho Church.