Meiji-mura Museum (博物館明治村) — Red Cross pavilion 博物館明治村

It opened in 1965 with 15 relocated buildings; today there are 67, eleven of them Important 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.

Aichi

SL名古屋駅

Demon Slayer: Kimetsu no Yaiba

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.

All the places from Demon Slayer: Kimetsu no Yaiba

https://theanimetrip.com/luoghi/museo-meiji-mura-padiglione-della-croce-rossa