Here's a mind-blowing look at Takeda Castle, a real castle in the sky. Originally constructed in 1441 on the summit of a mountain that towers nearly 1000ft over the surrounding terrain, the ruins of Takeda Castle span an area a quarter of a mile in length and more than 300 feet in width. The castle changed hands several times until Hirohide Akamatsu, a soldier who fought for Ieyasu Tokugawa's at the battle of Sekigahara, was appointed its lord in 1600. Within a year of his appointment, Akamatsu committed sepuku and Takeda Castle was abandoned. Continue reading for three videos and more information.
According to Japan Travel, "Takeda Castle is a great place to see fall foliage, sakura, or observe the "cloud sea" phenomena (best viewed in the early morning). Entrance to Takeda Castle Ruins is free, getting to them is not. The nearest city of any size is Toyooka on the San'in Main Line. The entrance to the castle is via a steep 1km long hiking course that starts next to Takeda Station on the Bantan Line, or by a taxi or car ride to the parking lot just below the summit. Takeda Castle Ruins makes a great day trip out of Kyoto."