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A man lays in a crevasse in a limestone rock wall formation. The formation has holes below where the man is laying.

A photograph of the Kaibab Suspension Bridge stretching across the Colorado River in the Grand Canyon. Two people stand on the bridge.

A man stands in front of cliff ruins, at the edge of a precipice.

Anasazi ruins in a cliff-face

Five horses and at least one human cross over the top of a sandstone ridge in partial silhouette.

A photograph of five people at the summit of Mt. Whitney. Two people are laying down among the rocks, the other three are standing around a cairn, facing outward.

Four men - three sitting among rocks on the summit and one standing nearby holding a pipe.

A shallow pool of water in the foreground, tall vertical rock cliffs in the background.

A woman lies on her back on a steep rock slope. Above her on the slope a pair of boots are visible. A group of people sit on the ground below her. In the background is the spray from a waterfall.

Two men and two women climb through large boulders, their backs to the camera.