13884182 - Hallett Peak in Rocky Mountain National Park, Rocky Mountains; Colorado, United States of America71414340 - Sunrise on Hallett Peak and Flattop Mountain above Sprague Lake in Rocky Mountain National Park, Colorado, USA71414341 - Sunrise on Hallett Peak and Flattop Mountain above Sprague Lake in Rocky Mountain National Park, Colorado, USA70150736 - Hallett Peak, Flattop Mountain, and Dream Lake. Rocky Mountain National Park. Colorado. USA