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Sentinel Tree in Grand Canyon National Park
Bar in the Colorado River in Grand Canyon National Park
Sierra Negra Volcano, Isabela Island, Galapagos
Antelope Canyon
Sunlight Diffusing into Antelope Canyon
Falling Silt in Antelope Canyon
Olduvai Gorge, Tanzania
Serengeti Hills, Tanzania
Bright Angel Trail at Tonto Plateau
Grand Canyon River Bar
Pockmark Rock, Grand Canyon
Once a Decade Fog in Grand Canyon National Park
