Sengen shrine

Where this is not possible because of distance or obstructions, a miniature replica of Mount Fuji known as a Fujizuka (富士塚) made from rocks from the mountain was often erected within the shrine grounds.

[6] Traditions also exist associating Mount Fuji with immortality-seeking wizards, and attribute the legendary mystical powers of En no Gyōja to his training on the mountain.

From the Heian period, the worship of the volcano kami as providers of water combined with Shingon esoteric Buddhism and with Shugendō practices.

Yamabushi Matsudai Shōnin is said to have climbed Mount Fuji several hundred times and built a temple, with the retired Emperor Toba as his patron.

[8] In the Edo period, the Fuji-kō, a religious confraternity system became extremely popular in the Kantō region, using magico-religious practices with talismans to protect followers from illness and catastrophe, despite efforts by the authorities to discourage it.