Dogo Onsen Honkan is a historic hot spring bathhouse located in Matsuyama, Ehime Prefecture, Japan. Built in 1894, it is one of the oldest onsen in the country and features traditional wooden architecture. The bathhouse is known for its soothing mineral-rich waters, which are believed to have healing properties. Visitors can enjoy various bathing options, including public baths and private rooms. The facility also has a charming tea room and a gift shop. Dogo Onsen Honkan is a popular destination for both locals and tourists, offering a unique experience steeped in Japanese culture and history.