Famous for the secluded temple town nestled on top of Mt. Koya, this little gem is the heart of Shingon Buddhism in Japan. A world away from Osaka and surrounded by towering trees, Koyasan is a welcome oasis for both pilgrims and visitors. Strolling among the hundreds of temples and monks going about their day makes for a lovely day trip (or overnight stay, if you opt for temple lodging!) from the hustle and bustle of modern city life.