Abeno Harukas

At 300m, this is Japan's tallest building. The 'Harukas 300' observatory spanning the 58th–60th floors offers unobstructed views in every direction — on a clear day you can see as far as Kyoto, Kobe, and even Awaji Island. The building also houses a department store, an art museum, and a hotel, so sightseeing, shopping, and dining are all under one roof.