Spanning 33,000-square-feet and situated on the top floors of a 49-story building in Monaco, this penthouse is now the world’s most expensive, with an asking price of $380-million. It features 6 bedrooms and a two-story water slide that goes directly into an infinity pool overlooking the ocean. As of right now the Tour Odeon penthouse is still under construction, and is slated to hit the market in 2014. Continue reading to see more.