Fuji-do, Natural cave monument in Karuizawa, Japan.
Fuji-do is a cave in Karuizawa that extends deep into the mountain with multiple chambers containing mineral formations. The walls display different geological patterns formed through natural processes over long periods.
The cave served as a dwelling place in prehistoric times, with excavations revealing stone tools and artifacts from these early inhabitants. These findings show that people sought shelter within these caverns thousands of years ago.
The cave holds meaning in local seasonal celebrations, where visitors can observe traditional practices that have been maintained over generations. Its connection to regional spiritual life appears in the customs performed at and within its entrance areas.
Visitors should wear sturdy shoes since the paths inside are uneven and sometimes slippery. Guided tours operate during the warmer months, and necessary equipment is provided at the entrance.
The interior remains at roughly the same temperature throughout the year, creating specific conditions for the growth of rare crystals. This stable environment enables geological processes that do not occur in warmer or colder surroundings.
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