Harajuku is teenybopper heaven, so it comes as something of a surprise to find this small but delightful museum tucked away on a side street. It specializes in ukiyo-e (woodblock prints), collected by the late Seizo Ota over a period of more than 50 years in an attempt preserve this uniquely Japanese art form. Although the collection contains 12,000 prints, fewer than 100 are displayed at any one time, in thematic exhibitions that change monthly. You can see it all in about 30 minutes. There's a tastefully curated gift shop in the basement that's well worth visiting (separate basement entrance for those not visiting the museum).