Nishiyama Onsen Keiunkan Nishiyama Onsen Keiunkan Nishiyama Onsen Keiunkan (西山温泉慶雲館) is a hot spring hotel in Hayakawa, Yamanashi Prefecture, Japan. Founded in 705 AD by Fujiwara Mahito, it is the oldest hotel and one of the oldest companies in operation. In 2011, the hotel was officially recognised by the Guinness World Records as the oldest hotel in the world. It has been continuously operated by 52 generations of the same family (including adopted heirs) for over 1,300 years. The Keiunkan lies at the foot of the Akaishi Mountains. Since its foundation the hotel has had all its hot water sourced directly from the
Sembawang Hot Spring horse races. That same year, the villagers urged the authorities to develop the area into a spa-like onsen tourist resort. However, F&N shelved the suggestion after geologists could not to trace the source of the spring water. In 1967, the proposal of the spa surfaced again, when F&N proposed plans for the development of a bathhouse, restaurants, a miniature golf course and even a nature reserve. However, the plans did not materialize, so the hot spring remained untouched and forgotten. In 1998, the Ministry of Defence (Mindef) acquired the land containing the spring for the expansion of the nearby Sembawang