Great Sand Dunes National Park, CO // A view from south reveals the diverse geology and ecology protected by Colorado's Great Sand Dunes National Park. Up to 750 feet high and covering 30 square miles of land at the base of the craggy Sange de Cristo range, these dunes are the tallest in North America. Their towering height is obvious when you're out in their heart, where the shifting hills block out everything but sand and sky, and you might as well be in the Sahara or the Rub'al-Khali. Yet despite the fluidity of sand dunes, opposing winds keep them surprisingly stable: the tallest dunes are still in the same places they were 100 years ago.
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