Koyasan, Japan
Path to temple in Koyasan.
CREDIT: DREAMING LIFE/GETTY IMAGES
The Buddhist monk Kobo Daishi founded this mountaintop temple town in 816. Today, the sacred and serene UNESCO World Heritage Site contains more than 100 temples, including head temple Kongobuji, featuring gorgeous gold-leaf interiors depicting the seasons. Within the ancient complex is a mausoleum and cemetery surrounded by cedar forest, with solemn giants up to 600 years old.