Mylodons Cave is a Natural Monument located in the Chilean Patagonia, 24 km northwest of Puerto Natales and 270 km north of Punta Arenas. The monument is situated along the flanks of the Cerro Benitez Mountains. It comprises several caves and a rock formation called Silla del Diablo (Devil's Chair).
The monument is notable for the discovery in 1896 of skin, bones and other parts of a giant ground sloth called Mylodon (Mylodon darwini). At the entrance of the monument is a life size replica of the prehistoric Milodon, which was a very large herbivore, somewhat resembling a large bear. It became extinct at the end of the Pleistocene Epoch.