Built in 1796 by a wealthy rice merchant, this traditional mansion is typical of the era, with front rooms used for entertaining guests and for business (the doorsill leading to the warehouse can be removed for easy transport), and the rear used as family living quarters. A front gate, usually allowed only the samurai class, is proof how important the Ohashi family was; another unique feature is a guesthouse, rare in merchant's homes. Once much larger (a hotel occupies the former garden), the home's 20 remaining rooms contain family heirlooms but are otherwise fairly empty. It's the only merchant's house open to the public, so come for a 15-minute spin through if you've never seen the inside of a traditional Japanese home.