The impressive stone walls of Marugame castle

Among the 12 surviving Japanese castles, Marugame features the most impressive defensive system. The castle's main tower was built on top of the Kameyama mountain, and the entire mountain was fortified, access to the tower being allowed only through a narrow path lined by 60 meters tall stone walls.

These are the highest walls in Japan, and together with the main tower, they survived until today ad they were during the Edo period.