Great Sand Dunes National Monument and Sangre de Cristo Mountains, 700 ft dunes are the tallest in North America, Colorado, USA, North America

North American elk (Cervus Elaphus) and sand dunes, Great Sand Dunes National Park and Preserve, Sangre Cristo Mountains in background, Colorado, United States of America, North America

Hiker on the sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Sand dunes in the Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Hikers on the sand dunes, Great Sand Dunes National Park and Preserve, with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

Sand dunes in the Great Sand Dunes National Park and Preserve with Sangre Cristo Mountains in the background, Colorado, United States of America, North America

A woman ice climbing up a frozen waterfall at Willow Lake in the Sangre De Cristo Mountains, Crestone, Colorado.

Usa, New Mexico, Santa Fe, Road and trees in Fall colors in Sangre De Cristo Mountains

United States, New Mexico, Santa Fe, Light snow on Sangre se Cristo Mountains

Usa, New Mexico, Santa Fe, Sunset above Sangre De Cristo Mountains

USA, New Mexico, Santa Fe, Colorful clouds at sunset over Sangre de Cristo Mountains

United States, New Mexico, Santa Fe, Evening light over snowcapped Sangre de Cristo mountains

Usa, New Mexico, Santa Fe, Sangre De Cristo Mountains

Usa, New Mexico, Santa Fe, Sunset above Sangre De Cristo Mountains

USA, New Mexico, Santa Fe, Colorful clouds at sunset over Sangre de Cristo Mountains