One of the largest grottoes in the island, houses a large stalactite-stalagmite compound, the tallest in Europe and one of the tallest in the world, measuring some 38 m in total. The grotto also include the so-called Abisso delle Vergini ("Abyss of the Virgins"), a c. 60 m-deep hole leading to a 12 km series of caves connecting Ispingoli to the other grotto of San Giovanni Su Anzu. Inside the cave were found traces of human bones and jewelry dating back the Bronze Age, the site was used as burial by the Nuragic Peoples.