The Great Sand Dunes are roughly 25 miles around at their base and over 700 feet high. Very impressive.

Great Sand Dunes National Park

Hikers on the dunes. Great Sand Dunes National Park

Great Sand Dunes National Park

Great Sand Dunes National Park

Great Sand Dunes National Park with the Sangre de Cristo Range in the background

Great Sand Dunes National Park

Great Sand Dunes National Park with the Sangre de Cristo Range in the background

Great Sand Dunes National Park

Great Sand Dunes National Park

Great Sand Dunes National Park

Great Sand Dunes National Park

Great Sand Dunes National Park with the Sangre de Cristo Range in the background

Sunrise, Great Sand Dunes National Park

Sunrise, Great Sand Dunes National Park

Great Sand Dunes National Park

Great Sand Dunes National Park

Sunrise. Great Sand Dunes National Park with the Sangre de Cristo Range in the background

Great Sand Dunes National Park

Great Sand Dunes National Park

Hikers on the dunes. Great Sand Dunes National Park

Hiker with his dog. Great Sand Dunes National Park

Great Sand Dunes National Park