Kinugasa Onsen is housed in a nondescript concrete building, like you see anywhere in Japan. The family that runs it though have been running a bath house at this location since the Edo-era. It is still a popular place for the locals to meet and for tourists to get a sense of what Japanese bath houses are all about.
Like every sentō, this bath house has its own unique selling point: a cold sauna. Cool down in this icy cold room before dipping into one of the hot tubs. It is a very pleasant sensation.