By A Mystery Man Writer
The sand dunes here are the highest in the U.S., some rising over 750 feet!
Great Sand Dunes National Park and Preserve
Great Sand Dunes National Park & Preserve – Mosca, CO
Great Sand Dunes National Park
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Sands of Time: A Natural History of Colorado's Great Sand Dunes
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Great Sand Dunes National Park & Preserve
Great Sand Dunes National Park and Preserve