High-altitude aerobic workout

The people who built the Gila Cliff Dwellings were tough. Hauling building materials up the side of a cliff? On their backs? Over and over? Wow. And they didn't have steps and bridges built by the National Park Service.

Being the soft, lazy guy that I am, and not really acclimated to the altitude, the hike up carrying only a camera had me wishing for an elevator. And the hike down had my left knee whimpering. Wuss.