Sumo is Japan’s most popular sport, and there’s nothing quite like joining 10,000 sumo fans for a match to learn about this ancient form of wrestling. The best place to experience sumo is at the Kokugikan Sumo Stadium (Ryōgoku Kokugikan), Tokyo’s largest indoor arena, where three of the six official national tournaments are hosted each year. Discover sumo’s place in Japanese culture at the attached Sumo Museum (Nihon Sumo Kyokai).