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Kenzo Tange's domineering Tokyo Metropolitan Government Building is worth visiting purely to have a good look at its spectacular edifice, but it's also home to a pair of free observation decks that have become a popular stop on many tourist itineraries. For good reason, too: unlike other contenders like Roppongi Hills (¥1,800) and Tokyo Skytree (¥2,100 and counting), the TMG's observatories are completely free of charge. Particularly popular at sunset, when clear days afford good views of Mt Fuji, the observation decks also serve refreshments.