The remains of an ancient settlement in one of the oldest archeological sites in South America.

An improbable waterfall springs from an orange-white cliff face, tumbling into the headwaters of the Virgin River above Zion National Park.

These delicate ruins need more tourists to keep them from fading away.

Ecuador's largest Incan ruins show evidence of sophisticated irrigation and diplomacy among the ancient builders.

This cave system allegedly holds the "metallic library" of a lost ancient civilization.

This stone complex marks the urban center of a lost civilization.

Are they the remains of a fallen hotel, or the final stronghold for escaped Nazis?

Stenciled handprints and wall paintings dating back 10,000 years, some of the earliest forms of cave art.

The inspiration for the Patagonia Clothing logo, Cerro Fitz Roy turns pink at sunrise.

This stunning mass of ice spans 121 square miles and is still growing.

An ancient Incan convent on Lake Titicaca's Island of the Moon.

Astronomical observatory above Lake Titicaca.

The depictions of slaughter are surprisingly detailed at this mysterious ancient site.

A remarkable geological formation resembling a forest made of stone.

A paradisical gorge with rapids, waterfalls, and wildlife whose raw beauty is the stuff of CGI movies.