The Torres del Paine National Park—an area of 2,400 km²—was declared a Biosphere Reserve by the UNESCO in 1978 and is a popular hiking destination. There are clearly marked and well maintained paths and many refugios which provide shelter and basic services. Views are breathtaking.
The best-known and most spectacular summits are the three Towers of Paine. They are gigantic granite monoliths shaped by the forces of glacial ice.