Saga Castle

Saga Castle (佐賀城, Saga-jō) stands out as one of Japan’s most distinctive flatland castles. Unlike typical castles built on stone bases, Saga Castle was surrounded by earthen ramparts and hidden by trees—earning it the nickname “Submerged Castle.” Its wide moats, some stretching over 80 meters, add to the majestic setting. Originally a fortified village held by the Ryuzoji clan, it was rebuilt by Nabeshima Naoshige in the early 1600s and remained in the family until the Meiji Restoration.

The highlight today is the impressive 2,500 m² reconstruction of the main palace, completed between 2001 and 2004. Made using four types of wood and over 700 tatami mats, it’s considered Japan’s largest wooden castle restoration. The restored structure now houses the Saga Castle History Museum, where visitors can explore samurai heritage, castle life, and local history through interactive exhibits and English-friendly displays. Entry is free, with optional donations, and includes a complimentary audio guide.