Also called the “Castle in the Sky,” Takeda Castle was built in 1441 on a 1,150-foot mountain ridge overlooking Tajima, Tanba, and the Maruyama River. The castle, admittedly in ruins, still makes an impression with its elongated structure that staggers over several levels, which gave rise to its second nickname, the "Machu Picchu of Japan." Takeda may only have stone walls and foundations left, but the real draw is its unkai, a magical weather pattern that enshrouds the castle in clouds and makes it seem like it’s floating. Unkai only happens maybe two dozen times every fall and lasts for only a couple hours. Time your visit to a brisk autumn morning and you just might get lucky.