The tour begins with a visit to the Milodon Cave, a natural monument located on Benitez Hill, 15 miles from Puerto Natales. You'll drive for 10 miles along Route 9, commonly called 'Natales-Bories', until you reach Miledón-Cerro Castillo. From this point you'll drive on gravel until you reach the Cueva del Milodón Natural Monument.
Inside the cave, discovered in 1895, you'll see remains of extinct animals such as the sabre-toothed tiger and the mylodon, a giant ground sloth.
At the site you'll have to walk for about a half an hour in the the cave to observe the stalactites and the places where the animal remains were found. You'll also see a replica of the mylodon. Be sure to admire the vegetation around the area, a unique landscape that is somewhere between steppe and forest, and observe typical trees such as the Ñire and shrubs such as the Calafate and Romerillo.