SAN LUIS VALLEY, CO – Great Sand Dunes National Park and Preserve at the foothills of the Sangre de Cristo Mountains in the San Luis Valley of southern Colorado. JULY 1, 2014. CREDIT: Erich Schlegel/Disappearing Rio Grande Expedition
SAN LUIS VALLEY, CO – Great Sand Dunes National Park and Preserve at the foothills of the Sangre de Cristo Mountains in the San Luis Valley of southern Colorado. JULY 1, 2014. CREDIT: Erich Schlegel/Disappearing Rio Grande Expedition