3Great Sand Dunes, Colorado
The Great Sand Dunes National Park and Preserve in Colorado is home to the tallest sand dunes in North America, with some reaching heights of over 750 feet. The dunes are set against the backdrop of the rugged Sangre de Cristo Mountains, creating a striking contrast between the desert and mountain environments. Visitors can hike, sandboard, or sled down the dunes, and the park’s clear night skies provide excellent stargazing opportunities. The otherworldly landscape of the Great Sand Dunes makes it a unique and must-see natural wonder in the U.S.
