The Normans built a motte-and-bailey castle in the late 11th century, and the moat is still one of the largest of its kind in Great Britain. The remains of this imposing motte and bailey castle ...

The most important thing [is] trying to find a business with a wide and long-lasting moat around it … protecting a terrific economic castle with an honest lord in charge of the castle.

WAKAYAMA—A rare event to explore the underwater world of Wakayama Castle’s moat took place here on Oct. 5 as volunteers and city officials lowered the water level, revealing a hidden ecosystem.