Koiwatake Castle, Mountain fortress in Azumino, Japan
Koiwatake Castle stands on a forested hilltop with stone fortifications and includes multiple defensive terraces across different elevation levels of the mountain.
The castle was established in 1522 by Nishina Morikuni and withstood a three-month siege in 1552 when 3000 soldiers under Takeda Shingen attacked 500 defenders.
The castle represents the architectural methods of mountain fortifications during Japan's Sengoku period, featuring climbing sub-baileys formed by large natural boulders.
The site contains reconstructed structures including a turret-gate and watch tower, which serve as viewing platforms for visitors exploring the castle grounds.
A cave beneath one of the site's boulders functioned as a storage area during the castle's active period, demonstrating innovative use of natural formations.
GPS coordinates: 36.35581,137.82844
Latest update: March 7, 2025 23:03
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