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
Sentō Sentō Another type of Japanese public bath is "onsen", which uses hot water from a natural hot spring. In general the word onsen means that the bathing facility has at least one bath filled with natural hot spring water. However throughout the Kansai region of Japan the word "onsen" is also a commonly used naming scheme for sentō. Sentō and supersentō in Kansai that do have access to a hot spring will often differentiate themselves by having "natural hot spring" (天然温泉) somewhere on their signage. There are many different looks for a Japanese "sentō", or public bath. Most traditional "sentō",