Nishiyama Onsen Keiunkan, Japan

Operating on the site of a natural hot spring since 705CE, this mountain retreat has been certified by the Guinness World Records as the World’s Oldest Inn. A half-hour drive north of Hayakawa, the inexhaustible water supply now feeds six external and internal baths, all of which have views over the lush valley. The four-storey hotel comprises 35 rooms with spring-supplied baths and a restaurant in which regional delicacies are seasoned with eight different types of salt.