Road trips from Southern California: New Mexico
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13. White Sands National Monument, N. M.( Yu Sui Kao )
White Sands National Monument, in south-central New Mexico is the largest pure gypsum dune field in the world. Parts of these dune fields are dynamic, with some of the dunes moving as much as 30 feet in one year. The national monument offers visitors a drive through the fields, as well as an explanation of how all that sand got there. Note: The monument is occasionally closed when the military is testing rockets nearby.
Visitors in 2009: 471,167
More info: http://www.nps.gov/whsa/index.htm