The document summarizes the history and key details of Kumamoto Castle in Japan. It discusses how the castle was constructed over 7 years in the early 1600s, its unique protective stone walls and wooden structures, and how it was rebuilt after being destroyed by fire in the 1800s. It also describes Kumamoto Castle as one of Japan's largest castles, known for its curved stone walls and rock barriers. Finally, it provides details about a 400th anniversary festival celebrating the castle's construction, including its multi-stage schedule from 2006-2008 with events like dawn ceremonies and celebrations of the different seasons.