Yellowstone: Top Photos

The caldera that powers half the world's geysers

A herd of bison stand in green grass with low mountains in the background. Bison, Lamar Valley Keywords: yellowstone national park; mammals; wildlife; bison; bison bison; 20160818_ndh-yell-9799
A herd of bison stand in green grass with low mountains in the background. Bison, Lamar Valley Keywords: yellowstone national park; mammals; wildlife; bison; bison bison; 20160818_ndh-yell-9799 © Neal Herbert, Public domain, via Wikimedia Commons

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