Arizona's Lower Antelope Canyon, on the Navajo Indian Reservation, is an incredible place. It begins as a crack in the middle of a dry riverbed, just barely large enough to squeeze through, and then it quickly drops deep underground. The canyon, literally an underground labyrinth, was carved by subterranean water flowing through miles of sandstone.

In some areas of the caverns, crevasses and tunnels, although far below ground level, sand from the desert floor spills down. Like a waterfall, the sand flows over the edges of the canyon walls, pulled by gravity, to the ground deep below the desert's surface, creating many unforgettable scenes such as this one.

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