The pamphlet tells me this is a "castle" — but the structure in front of me defies that description. Granted, my frame of reference is greatly informed by the impressive edifices of Kumamoto, Himeji and Matsumoto that date back to the gory Sengoku (Warring States) Period spanning some 150 years from the mid-15th century before the country was unified under the Tokugawa Shogunate.