It opened in 1965 with 15 relocated buildings; today there are 67, eleven of them Important Cultural Properties.
The open-air museum opened on 18 March 1965 on the shores of Lake Iruka, in Inuyama, with fifteen historic buildings dismantled elsewhere and rebuilt here. Today it has 67, including steam locomotives; eleven (fourteen structures in all) are Important Cultural Properties, and most of the others Registered Tangible Cultural Properties.
A museum park of Meiji architecture in Inuyama, where original late-nineteenth-century buildings have been dismantled and rebuilt. You can visit the Inuyama citadel, a few kilometres away, on the same trip. Address 犬山市内山1.
🚉 SL名古屋駅 · 4 min walk
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The pavilion of the Japanese Red Cross Central Hospital, a Registered Tangible Cultural Property, is the most frequently cited model for Shinobu Kochō's Butterfly Mansion: the wards with their rows of beds, the white walls and the corridors lit by large windows are almost a match for the anime's shots. The park also has a steam locomotive that readers link to the Mugen Train. It is an attribution by readers, never confirmed by the production; other places cited as models for the Butterfly Mansion are the 遠山記念館 in Saitama and the 無声堂.
Sources: ja.wikipedia.org · kimetsu-i.com · biwa13.com · niche-japan.com (no longer reachable)
Nearby
Inuyama Castle6.9 kmphoto by Tomio344456 · CC BY-SA 4.0
Skyward Asahi13.9 kmphoto by KAMUI · CC BY-SA 3.0
World Freshwater Fish Aquarium — Aqua Toto Gifu16.6 kmphoto by 世界淡水魚園水族館 · CC BY-SA 4.0
Seki Forging Museum16.9 kmphoto by Hide-sp · CC BY-SA 3.0