Two visitors at Perito Moreno Glacier in the Parque Nacional de los Glaciares (Los Glaciares National Park), UNESCO World Heritage Site, Patagonia, Argentina, South America

Perito Moreno Glacier in the Parque Nacional de los Glaciares (Los Glaciares National Park), UNESCO World Heritage Site, Patagonia, Argentina, South America

Detail of Perito Moreno Glacier in the Parque Nacional de los Glaciares (Los Glaciares National Park), UNESCO World Heritage Site, Patagonia, Argentina, South America

Perito Moreno Glacier in the Parque Nacional de los Glaciares (Los Glaciares National Park), UNESCO World Heritage Site, Patagonia, Argentina, South America

Perito Moreno Glacier, Parque Nacional de los Glaciares, UNESCO World Heritage Site, Patagonia, Argentina, South America

Detail of Perito Moreno Glacier in the Parque Nacional de los Glaciares (Los Glaciares National Park), UNESCO World Heritage Site, Patagonia, Argentina, South America

Detail of Perito Moreno Glacier in the Parque Nacional de los Glaciares (Los Glaciares National Park), UNESCO World Heritage Site, Patagonia, Argentina, South America

Silhouette of a visitors walking the passageway at Perito Moreno Glaciar in Parque Nacional de los Glaciares, UNESCO World Heritage Site, Patagonia, Argentina, South America

Mountain range with Cerro Fitz Roy at sunrise reflected in Lago de Los Tres, Los Glaciares National Park, El Chaltén, Santa Cruz Province, Patagonia, Argentina, South America

National Park Shield, at the back Mount Cerro Fitz Roy, Los Glaciares National Park, El Chaltén, Santa Cruz Province, Patagonia, Argentina, South America

Katy Holm sorts gear at the base Cerro Pollone in Argentine Patagonia. January 2005