Copper Canyon (Barranca del Cobre) is one of North America's most spectacular sights. Nine major canyons -- all deeper than the U.S.'s Grand Canyon -- form a labyrinth through Mexico's Sierra Madre Occidental mountain range. Home of the famed Tarahumara (Raramuri) runners, refuge of revolutionary Pancho Villa, and birthplace of the legendary Zorro, this is Copper Canyon -- The Treasure of the Sierra Madre.