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While the Atami Castle was built in 1959 (the castle is, therefore, not a real historical site, but rather a tourist spot), it is still an interesting place to visit - there's a small museum collecting information about samurai, ukiyo-e (adult only), and castles in Japan. There's also a panoramic view on top, and a trick art museum there.
Atami Castle is a Japanese castle replica on the summit of Nishikigaura Mountain in Atami, Shizuoka Prefecture. It is one of the most scenic spots in Atami City, offering a panoramic view of the city and southern Atami. The building hosts several museums on Japanese history. 200 sakura trees were planted in the castle's garden, which hosts a cherry blossom festival from late March to early April. First constructed in 1959, Atami castle is not a real historical site.
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熱海秘宝館
If lolling about in hot water has gotten you all hot and bothered, this overpriced erotic museum will fan the flames a bit. Nearly every Japanese hot spring town used to have one of these, but they've very much an endangered species now and this is one of the few left in the entire country. Adults (18 or older) only.
MOA美術館
Opened in 1982 to house some of the collection of spiritual leader Mokichi Okada (see box), the displays here run the gamut from Japanese calligraphy to Tang-dynasty pottery, with a roomful of Matisse, a tea room covered in gold leaf and Socialist-realist bronze sculptures thrown in for flavor. But there's a uniting thread to it all, as according to Okada, "Art must meet three conditions: it must be true, it must be good, and it must be beautiful." No falsehood, evil, or ugliness; no death, no old age, no sickness; no sorrow, no hate, no pain, no lust. The overall effect is a little eerie, but beautiful just the same and well worth a visit. The entrance to the museum is particularly striking.