inside underground prometheus cave, also known as kumistavi cave, tskhaltubo cave or tskhaltubo gliana cave, western

cave geology stalactite speleology underground mystery formation mineral majestic tskaltubo stalagmite illumination limestone georgia nature stone rock cavern natural inside dark travel karst beautiful prometheus geologic background colourful landscape art colours imereti kutaisi tour tourism beauty geological kumistavi georgian europe deep fossil earth drop tunnel