Shirakawa Barrier - Credit: Wikimedia Commons
The is the location of a frontier fortification on the Ōshū Kaidō highway in what is now the Hatajuku neighborhood of the city of Shirakawa, Fukushima Japan, three kilometers south of the border of Tochigi Prefecture The site was designated a National Historic Site in 1966., and is part of the Shirakawa Seki-no-mori Park, containing a reconstructed ancient house and preserved old farm houses. Read more on Wikipedia
Source: en.wikipedia.org