Tochimoto-no-seki栃本関跡 - Credit: Wikimedia Commons
The was a security checkpoint on the road connecting Kai Province with Musashi Province via the Karisaka Pass in the Okuchichibu Mountains in Edo period Japan. In 1970, the surviving building of the checkpoint on the Musashi side of the pass (now part of the city of Chichibu, Saitama) was recognized as a National Historic Site. Read more on Wikipedia
Source: en.wikipedia.org