A specially constructed turret in Japanese castle architecture, a turret with multiple gates. It is sometimes also called a nagaya.
Tamon-yaguras were built as long turrets on the castle walls. They were placed in important circles such as Honmaru (main vailey) and Ninomaru (second bailey), and were built at the edge of the stone wall in place of an earthen wall so that they could also be used as soldiers’ quarters, thus contributing to the defence of the castle.