Saturday, July 11, 2026

Question: In Colorado’s San Luis Valley, at the foot of the Sangre de Cristo Mountains, a national park protects the tallest sand dunes in North America. What is it?

Answer: Great Sand Dunes National Park and Preserve. Its dunes rise about 750 feet above the valley floor, the tallest in North America, formed over thousands of years as winds carried sand across the San Luis Valley toward the mountains.