Colorado is home to the tallest sand dune in the U.S. You can find the tallest sand dune in the U.S. is at the Great Sand Dunes National Park and Reserve.

The Great Sand Dunes National Park and Reserve near Alamosa is where you can find the tallest sand dunes in the United States and North America. The park and reserve's main dune area is about 30 square miles, according to the Great Sand Dunes.

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You can visit the sand dunes in Colorado 24 hours a day, 7 days a week, and is also home to some of the oldest known archeological sites in the United States. Let's take a look at the tallest sand dune in the U.S. and one of the most uniquely beautiful places in Colorado -- the Great Sand Dunes.