Here's Bunker 42, a combination museum/restaurant/karaoke bar that's 65 meters underground in a Cold War nuclear bunker in Moscow. The 75,000 square foot facility was completed in 1956 and could house and feed up to 3,000 people for 90 days. The bunker was purchased by a private company in 2006 and renovations continue today. Also, you can get married there — nothing says I love you like posing for photos in Stalin's meeting room — and they provide programs for children like the post-nuclear game "Zombie Apocalypse." Below, a video tour of the facilities; the restaurant/club portion is around the 4:00 minute mark.
Video: Inside Bunker 42