Tim Fitzharris / Double rainbow over Boulder Mountains after a storm, Idaho

Tim Fitzharris / Mountain at sunset, El Capitan, Guadalupe Mountains National Park, Texas

Tim Fitzharris / Boulder Mountains and Summit Creek, Idaho

Tim Fitzharris / Granite boulders, Castle Rocks State Park, Idaho

Tim Fitzharris / Nokhu Crags (12,485 feet) and lake, Rocky Mountains, Colorado

Tim Fitzharris / Wichita Mountains National Wildlife Refuge from Mount Scott summit, Oklahoma

Tim Fitzharris / Boulders at Guadalupe Mountains National Park, Texas

Tim Fitzharris / El Capitan, Guadalupe Mountains National Park, Texas

Tim Fitzharris / Boulder field and El Capitan, Guadalupe Mountains National Park, Texas

Tim Fitzharris / Easely Peak, Boulder Mountains, Idaho

Tim Fitzharris / Boulder Mountains and Summit Creek dusted with snow, Idaho

Tim Fitzharris / Boulders on lakeshore at sunset, Polly Dome, Sierra Nevada, Yosemite National Park, California

Tim Fitzharris / Sunset on Half Dome from Olmsted Point, Sierra Nevada, Yosemite National Park, California

Tim Fitzharris / Boulders on Hurricane Mesa near Hunter Peak, Wyoming

Tim Fitzharris / Light snow covering Boulder Mountains, Idaho

Tim Fitzharris / Creek and Boulder Mountains, Idaho

Tim Fitzharris / Boulder Mountains and Summit Creek in winter, Idaho

Tim Fitzharris / Rocks, Rocky Mountain National Park, Colorado

Kevin Schafer / Cosby Creek flowing through forest, Great Smoky Mountains National Park, Tennessee