Built at an altitude of 430m, close to the summit of Mt. Gagyu, Bitchu Matsuyama Castle is the highest mountain castle with a surviving Donjon Tower, and is now designated as an Important Cultural Property in Japan. From late September to early April, when the climate condition permits, you will get to see a sea of clouds around the castle. And, from the Castle’s Observation Deck, one can see the magical spectacle of the castle seeming to float in a sea of clouds.