Dead tree trunks, Canary Spring, top Main Terrace, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Woman relaxing in hot spring, Mammoth Lakes region, California, United States of America, North America

Woman relaxing in hot spring, Mammoth Lakes region, California, United States of America, North America

Dead tree trunks, Canary Spring, Main Terrace, Mammoth Hot Springs, Yellowstone National Park, UENSCO World Heritage Site, Wyoming, United States of America, North America

Carbon Dioxide Hazard Area warning sign around Horseshoe Lake, Inyo National Forest

Carbon Dioxide Hazard Area warning sign around Horseshoe Lake, Inyo National Forest

Hexagonal pattern on the top surface of basalt columns at Mammoth Lake, Devil\'s Postpile National Monument, California, USA

Male highliner in cowboy hat walks a 125 foot highline over a lake in a gap on top of Mammoth Crest, Mammoth, California, United States

Male highliner jumps off a 125 foot highline over lakes in a gap on top of Mammoth Crest, Mammoth, California, United States

Male highliner in cowboy hat walks a 125 foot highline over a lake in a gap on top of Mammoth Crest, Mammoth, California, United States

Devils Post Pile Basalt colums, Mammoth Lakes, CA

Backpackers cook lunch near a stream. Photo by Thomas Kranzle, United States of America