Trail 12 at Valles Caldera National Preserve, New Mexico

Valles Caldera is a 13.7-mile wide volcanic bowl in the Jemez Mountains of northern New Mexico near Los Alamos. About 1.25 million years ago, a spectacular volcanic eruption created this circular depression now known as the Valles Caldera. The Valles Caldera Preservation Act of 2000, signed by President Clinton, created the National Preserve. The preserve is known for...

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