No longer exists as an independent company though. > In January 2006, after falling on difficult times, it became a subsidiary of the Takamatsu Construction Gr

No longer exists as an independent company though. > In January 2006, after falling on difficult times, it became a subsidiary of the Takamatsu Construction Group. The oldest one that still operates independently appears to be still from Japan, though: https://en.wikipedia.org/wiki/Nishiyama_Onsen_Keiunkan https://en.wikipedia.org/wiki/Nishiyama_Onsen_Keiunkan