Koya-san is arguably one of the most sacred sites in all of Japan and an overnight stay in one of its temples is strongly recommended. Several complexes dot the mountain area but don't miss Okunoin's 2km path up to a mausoleum and the temple room filled with golden lanterns. Coming from Osaka? You can get an all inclusive day pass that covers your transport and admission. #koyasan #wakayama #temples #mountains #westjapan #architecture