Ōmeguri-Komeguri Mountain Castle

Ōmeguri-Komeguri Mountain Castle - Credit: Wikimedia Commons

was an ancient castle (also known as a located in what is now the Kusakabe neighborhood of Higashi-ku of the city of Okayama, Okayama Prefecture, in the San'yō region of Japan. Its ruins have been protected as a National Historic Site since 2005. Read more on Wikipedia

type: military installation
date from: c.7th century

Source: en.wikipedia.org