Sapphire Pool, Yellowstone national park, Wyoming

Cliff Palace, Mesa Verde, as seen from the ruins, Colorado

Old Faithful, Yellowstone national park, Wyoming

Bluffs of the Green river, Wyoming

Silver Apron, Yosemite valley, California

Castle Geyser, Yellowstone national park, Wyoming

The Devil’s Slide, Weber Canyon, Utah

Pulpit Terraces from above, Yellowstone national park, Wyoming