The Fuuketsu Lava Cave (Fu = wind) is a natural cave made by the eruption of Mount-Fuji in 1864. It is located very close to the Narusawa Hyouketsu lava cave.
share photos of Japan from GaijinGoJapan
Fugaku Lava Cave sign
Visiting Fugaku Lava cave
Happy visitor of Fugaku Lava Cave
The Fugaku Lava cave still has ice in August
Inside Fugaku Lava Cave