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

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

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.

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

Anasazi ruins in a cliff-face

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

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

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

One man steers a small boat while another sits on the shores of the river, canyon walls in background.

Photographed through narrow canyon walls, a small boat approaches the mouth of a creek where it joins the Colorado River.