Despite a turgid economy and the rise of online dating, the nightclub industry is blowing up. Last year, Nightclub and Bar reported that the top 100 highest earning nightclubs in the U.S. generated 1.5 billion in combined revenue. With such competition, some clubs are taking drastic steps to become legendary. From caveside raves to castle throwdowns, these seven nightclubs have proven that they'll go all the way to show you a good night.