Mori Tower 53F, 6-10-1 Roppongi, Minato, Roppongi; While school groups and tour guides take over Mori in the day, this sky-high museum belongs to young creatives come evening. Sure, the thought-provoking exhibitions – ranging from installations to multimedia displays – are best explored without the crowds, but the real nightly draw is the Sky Deck. When you finish trawling the galleries, follow the locals to this rooftop, reflect with a cocktail, and marvel at the glittering dark sky. The rooftop Sky Deck hosts cool star-gazing parties. Check online before you visit to try to catch one.