Shinjuku’s skyscraper district, Nishi-Shinjuku, is an architecture buff’s paradise, with many fascinating buildings, including the curved glass-and-steel Mode Gakuen Cocoon Tower. But the most famous is probably the Tokyo Metropolitan Government Building, or Tocho for short. When it was constructed in the early 1990s, it was the tallest skyscraper in all of Tokyo. It may have been passed up in height since then, but the cathedral-like building continues to offer unmatched views from its two free observation decks. To take in the panorama, head to the 45th floor, 202 meters above ground. Up here, you’ll get a sense for just how big Tokyo really is. On an exceptionally clear day, you can see all the way to Mount Fuji. For a different experience, come at night (the north observatory is open until 11 p.m.) to see the glittering skyline below.