About Perito Moreno Glacier: Perito Moreno is famous for the thunderous crash of ice breaking off its front. Unlike most glaciers today, it is not shrinking. Its towering ice wall stands about as tall as a 20-story building above the lake. It sometimes grows across the lake and dams it, until the water bursts through in a — spectacular collapse

Location: Los Glaciares National Park, southern Argentina · Size: About 30 km (19 mi) long, with an ice face around 5 km wide · Ice Face: Rises roughly 70 m (240 ft) above the water · Country: Argentina · Type: A valley glacier fed by the Southern Patagonian Ice Field · Flows Into: Lake Argentino · Notable Feature: One of the few glaciers in the world that is not shrinking · Famous Sight: Huge chunks of ice regularly crash off its front with a roar (calving) · World Rank: One of the most famous glaciers in the world