Though relatively newly reconstructed structures and inaccessible buildings (unlike favored Nijo Castle), the gardens at the Kyoto Gosho makes this a worthy visit thanks to its otherworldly views.
An unexpected enjoyable visit to Hikone Castle, one of the 12 original castles.
Visiting the White Heron Castle, Himeji-jō, the largest castle in Japan and one of the 12 original castles of Japan.
A short trip to Hamamatsu in Shizuoka prefecture, visiting Hamamatsu Castle where Ieyasu spent 17 years during his younger days and Kanzanji, a Zen-Buddhist temple on Mt. Tateyama.
Though having lost its castle keep, Nijo Castle is a worthy visit for its Ninomaru Palace, a rare surviving example of Japan’s castle palace.