The Tokugawa Clan Mausoleum, located on the sacred Mount Koya, is a significant historical site built in 1643 by Tokugawa Iemitsu, the third shogun of the Tokugawa dynasty. This mausoleum complex honors the first two shoguns of the Tokugawa lineage, Ieyasu and Hidetada, with two identical, lavishly decorated buildings that reflect the opulent style of the early Edo Period.