The Torres del Paine National Park covers 181,000 hectares, according to their website and is close to two towns where many treks begin.
Puerto Natales and Punta Arenas offer plenty of places to stay and things to do while exploring the mountains. In Puerto Natales take a tour over to Milodon Cave and see the limestone formation famously known as Silla del Diablo, or the Devils Chair. The cave itself was named after the 1986 discovery of the remains of a giant ground sloth called Mylodon. The remains are still visible throughout the area, according to the park.
Take a three-day trek through the park and explore the flora and fauna that you will come across while climbing through the Ascencio. Walk through Frances Valley before winding your way up Grey Glacier for spectacular views of the mountain ranges.
In order to minimize your environmental impact in the national park, traveling with a small group is recommended.