Berghain, Berlin
Located in a discrete former power plant, Berghain is one of the coolest clubs you will probably never get into. People are known to wait hours to get in only to be turned away by the infamous (and terrifying) bouncer Sven Marquardt. In the event that you actually do get in, you will experience 24 hours of nonstop partying. Warning: they have a very strict no photos allowed policy.
[Photo via @Berghain_ostgut]