Ephedra spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Abyss Pool, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Blue Funnel spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists looking at Seismograph and Bluebell pools, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Abyss Pool, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Fishing Cone, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

View of Duck Lake and Yellowstone Lake at dusk from near West Thumb, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Thumb geyser, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Devil's Thumb and Palette Spring, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Black Pool, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Thumb paint pots, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Blue Funnel spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Blue Funnel spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Run off area near Black Pool Spring, West Thumb Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Village of St. Peter with abbey, Architekt Peter Thumb, Southern Part of Black Forest, Black Forest, Baden-Wuerttemberg, Germany, Europe

Village of St. Peter with abbey, architect Peter Thumb, Southern Part of Black Forest, Black Forest, Baden-Wuerttemberg, Germany, Europe