Ruins of a former castle from the Muromachi period, located within Akatsuka Park in Itabashi. Only dry moats and earth mounds remain, but informational signs provide historical context. The site is surrounded by forested areas and is close to a botanical garden and local museums. The atmosphere is peaceful and minimally developed, ideal for a quiet walk.

Price: Free entry
Touristy? Not very touristy. Mainly visited by locals and regional history enthusiasts.