A mysterious limestone cave where fireflies live

Bitchu Kanachiana cave is the oldest limestone cave in Japan and extends to the Jobodai limestone plateau in Maniwa, Okayama prefecture. The cave was a famous place of the Heian period and was recorded in documents.
About 300m of the cave's entire length of 800m is open to the public for sightseeing. You can enjoy mysterious scenery in a cave that nature created, such as Mount Fuji in a Cave, which is a large stalagmite with a height of 3m and a diameter of 5m, and the Five-Storied Pagoda, which is made up of 22 layers of stalactites and is said to be the best in Japan.
The inside of the cave is cool even in the summer and seems like it is naturally air-conditioned. It is known as a place where you can even enjoy the wild dance of the Hime firefly.