The central features of this natural attraction is the large labyrinthine limestone cave with its unique rock formation, its stalactites, stalagmites, and abundance of overhead ceiling pockets, and bats.

Green Grotto is 1,525 meters long and 12 meters deep and is characterized by numerous chambers and light holes and a subterranean lake –the Grotto Lake-occupies its bowels, a must see while on the Island. .