gyokusendo cave at okinawa world.

approximately aura background beautiful blue burrow canister cave cavern cavity ceiling covered exotic fall famous floor flora flower flowers formation formations fourtain garden geologic geological geology gyokusendo hole island islands japan landscape light limestone look meaning mountain mystery natural nature niche okinawa paradise photo pool purple river rock rocky sanctum sandbars shape sign silver spectacular stalactite stalactites stalagmite stalagmites star stone strange texture tourism travel tunnel underground wall water world