530 W. 28th St., 212-629-9000, m2ultralounge.com
On Chelsea's western border, cubic acres of industrial space have been converted into what is now known as "clubland," a planet unto itself that unleashes mega-spectacular dance experiences every Thursday, Friday and Saturday nights. M2 is at the top of this game, mixing intimate lounge aesthetics across three roaring dance floors. The menu boasts roughly 40 varieties of champagne (ranging from $240 to $6,500), and plenty of other libations for the thirsty. Shoot for the bottle-service balconies along the main room that provide an eagle-eyed view of the mayhem on the floor and stage. Well-patrolled streets keep revelers in order outside the club, but on the inside, it's on. Forewarned is forearmed: drinks don't come cheap at M2 unless you're a Page Six regular.

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