Kiyama (Kagawa)

Kiyama (Kagawa) - Credit: Wikimedia Commons

was an ancient castle (also known as a located in the city of Sakaide, Kagawa, Japan, and extending partly into the neighboring city of Marugame. Its ruins have been protected as a National Historic Site since 1951. It is also known as Shiroyama Castle or Sanuki-Shiroyama Castle. Read more on Wikipedia

type: military installation
date from: 668-670

Source: en.wikipedia.org