Raizan Castle, Ancient mountain fortress in Itoshima, Japan.
The castle extends along mountain slopes with two kilometers of earthen ramparts and includes eight strategic watchtower positions for military surveillance.
Construction began in 756 AD under Kibi no Makibi's direction after his return from Tang China, incorporating advanced fortification techniques learned during his diplomatic mission.
The foundation stones and flat roof tiles measuring 41 by 31 centimeters demonstrate the engineering capabilities of craftsmen during the Nara period.
The archaeological site remains open to visitors, with excavated artifacts displayed at the nearby Itokoku History Museum in Itoshima.
The fortress builders mixed seawater and lime-based materials into the earthwork construction to increase the durability of the fortification walls.
Location: Itoshima
GPS coordinates: 33.50004,130.21847
Latest update: March 3, 2025 13:39
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