Torres del Paine rises above the Patagonian steppe as three near-vertical granite towers, the tallest reaching about 2,500 metres. They are young as mountains go — the exposed core of a laccolith, a pod of magma that pushed up between layers of dark sedimentary rock around twelve and a half million years ago. Glaciers and wind later stripped the softer rock away, leaving pale granite spires and, on the neighbouring Cuernos (the Horns), a striped profile where dark caprock still sits on a granite base. The park lies at the southern end of the Andes, where the last ice age still lingers: glaciers spilling off the Southern Patagonian Ice Field calve icebergs into milky, blue-green lakes. Chile protected the area in 1959, and UNESCO named it a Biosphere Reserve in 1978.
The classic way in is the W trek, an 80-kilometre route that strings together three valleys: the steep climb to the towers above a glacial tarn, the avalanche-rumble of the French Valley, and the cracked blue wall of Grey Glacier. The wind is relentless — strong enough to make standing hard, yet it can also clear the sky in seconds. Hikers who reach the base lookout before dawn and wait are sometimes rewarded with a few minutes of flame-red light on the granite, though clear mornings are rare. Away from the trail, this is the surest place on Earth to see a wild puma: hunting was banned in 1972, and the park now holds the densest puma population anywhere, its cats shadowing the guanaco herds that graze the open steppe.