The Chinkaizan Castle Ruins, a city-designated historic site, is a mountain castle that tells the story of the Noshima Murakami Pirates, who controlled the seas during the Sengoku period and established a base in Takehara.
In 1585, Murakami Takeyoshi, the supreme commander of the Mishima Murakami Pirates, and his son Motoyoshi were driven from Noshima and moved to Takehara, the territory of Kobayakawa Takakage, where they built a castle on this mountain.
They used this site as a base for about six years until 1601, while continuing to fight in various regions.
The castle ruins are located on a small hill that once projected like a cape into a deep bay, with a structure of terraced enclosures centered around the main bailey at an altitude of 88.1 m.
Stone remains still exist in the main bailey, and it is said that Shiroyama Shrine was once enshrined here.
To the northwest, a Hokyointo pagoda for the castle lord Murakami Motoyoshi, who died in the Battle of Sekigahara, and Gorinto towers said to be graves of those killed in battle stand together, quietly telling the story of the turbulent Sengoku period.
