Hotel hospitality to travellers have been a feature of the earliest civilizations. In Greco-Roman culture and ancient Persia, hospitals for recuperation and rest were built at thermal baths. Japan's Nishiyama Onsen Keiunkan, founded in 705, was officially recognised by the Guinness World Records as the oldest hotel in the world. During the Middle Ages, various religious orders at monasteries and abbeys would offer accommodation for travellers on the road. The precursor to the modern hotel was the inn of medieval Europe, possibly dating back to the rule of Ancient Rome. These would provide for the needs of travellers, including food and
Onsen hiragana character ゆ ("yu"), understandable to younger children, is used. Traditionally, onsens were located outdoors, although a large number of inns have now built indoor bathing facilities as well. Nowadays, as most households have their own bath, the number of traditional public baths has decreased, but the number of sightseeing hot spring towns has increased (most notable ones including Kinosaki Onsen, , and ). Onsens by definition use naturally hot water from geothermally heated springs. Onsens are different from sentō, indoor public bath houses where the baths are filled with heated tap water. Traditionally, men and women bathed together at