Nishiyama Onsen Keiunkan is a hot spring inn located in Hayakawa, Yamanashi Prefecture, Japan. It is the oldest hot spring inn in Japan, having been in operation since 705 AD. The inn offers a
From Wikipedia
Nishiyama Onsen Keiunkan is an onsen ryokan in Yamanashi Prefecture. Founded in 705 by Fujiwara no Mahito, it is a prime example of shinise and perhaps the oldest independent company in operation following the acquisition of construction company Kongō Gumi in 2006.