- Nagoya Castle is open today.
Hommaru palace Admission Waiting Time;00Minutes. As of
Nagoya Castle was completed in 1615 by the Shogun, Tokugawa Ieyasu. Topped with golden shachihoko, votive tiger-fish roof devices, and boasting the largest floorspace of any tower keep, Nagoya Castle and its magnificent Hommaru Palace were operated as a military facility. Nagoya Castle was Japan’s first castle to be designated a National Treasure. Even after wartime air raid destruction, it was deemed historically important enough to be designated a National Historic Site. Restoration work being carried out is returning Nagoya Castle to original condition.