Kongobuji Temple is famous for its rock garden, which is Japan’s largest covering 2340 square metres. This garden and those surrounding the temple are particularly famous for their orange and red Autumn leaves. Kongobuji Temple is a Buddhist temple, which is the head temple of the Koyasan Shingon Buddhism sect and is on Mount Koya in Wakayama Prefecture. Kongobuji mean Temple of diamond mountain. Kongobuji Temple Kongobuji Temple was first constructed in 1593 by Toyotomi Hideyoshi and then rebuilt in 1861. Kongobuji Temple is a UNESCO World Heritage Site and forms part of the Sacred Sites and Pilgrimage Routes in the Kii Mountain Range listing.