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PARK CITY, Utah — Great Sand Dunes National Park and Preserve in Colorado offers a much bigger and more accessible dune field than any other unit of the National Park System. These are, in fact, the highest dunes in North America and have been protected since local residents successfully lobbied for a 1932 national monument proclamation.
The area was expanded to its current boundaries and renamed a park and preserve in 2000. The sand captured in these dunes originated about 65 miles west in the San Juan Mountains. As the sand blew east it mixed with sand and pebbles washed down from the Sangre de Cristo Mountains and it was all stirred together in an ancient lake.
Read the full story from National Parks Traveler.