13882171 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. Excelsior Geyser Crater is about 100 yards north of Grand Prismatic Spring. These two features are the main attractions in Midway Geyser Basin. Excelsior last erupted in the 1880s, throwing water perhaps as high as 300 feet and discharging enough water to raise the level of the nearby Firehole River by up to a foot. This geyser when active, was the largest ever recorded in Yellowstone. Excelsior Geyser C13882145 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic, colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and shows a pair of convection currents, like a pair of eyes. As the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne R13882172 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic or colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and as the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne Russell's Journal of a Trapper, by the name of Boiling La13882191 - Excelsior Geyser Crater is about 100 yards north of Grand Prismatic Spring and two of the main attraction n Yellowstone National Park. Excelsior last erupted in the 1880s, throwing water perhaps as high as 300 feet and discharging enough water to raise the level of the nearby Firehole River by up to a foot. Excelsior Geyser Crater is still producing an impressive amount of hot water, about 3000 gallons a minute; Yellowstone National Park, Wyoming, United States of America13882287 - Terraced mineral deposits and steam vapors at the Mammoth Hot Springs in Yellowstone Natural Park; Wyoming, United States of America13882140 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic or colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and as the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne Russell's Journal of a Trapper, by the name of Boiling La13882241 - Crater Hills Geyser (Sulphur Sring) with its heated water pool and high content of sulphur creating steamy vapors with green and yellow thermal runoff channels and sinter extensions in the Hayden Valley in Yellowstone National Park; Wyoming, United States of America13773040 - Orakei Korako Thermal Park, Lake Topo Area; North Island, New Zealand13882144 - Grand Prismatic Spring is one of the largest and most beautiful examples of a common hydrothermal feature in Yellowstone National Park and one of the largest hot springs in the United States. The prismatic, colorful features come from several sources; the deep blue in the center is the clear super-heated water circulating up from the subterranean heat source and shows a pair of convection currents, like a pair of eyes. As the water cools at the edges of the pool and on the sinter terraces, bacteria and algae produce the rainbow of colors. This hot spring was specifically mentioned in Osborne R70036132 - Sinter terraces of Pamukkale, Turkey70029484 - Sinter Terraces, Pamukkale, Western Turkey10307198 - Shadow of woman on sand in Pamukkale, Aegean, Turkey10306679 - View of Pamukkale in Aegean, Turkey70396118 - The Baradla Show Cave in the Aggtelek National Park, Hungary During the first years as a show cave, visitors used torches for light source The grime from the torches resulted in a black colored surface, which is now covered by a small layer of sinter T70396116 - The Baradla Show Cave in the Aggtelek National Park, Hungary Hall of the Giants, details of a dripstone The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one o70374267 - Speleology, caving, speleothem, concretion, aragonite, Lozère (France)70374273 - Speleology, caving, caver looking at big orange stalactites70396110 - The Baradla Show Cave in the Aggtelek National Park, Hungary The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one of the major attractions of Hungary with abou70396109 - The Baradla Show Cave in the Aggtelek National Park, Hungary, sinter straws The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one of the major attractions of Hu70374278 - Speleology, caving, caver in a vertical gallery, Grotte de la Cocalière, Gard, France70374274 - Speleology, caving, caver looking at big orange stalactites70374269 - Speleology, caving, caver in a gallery, Gard (France)70374243 - USA, Hawaï, Caving, Lava tube, volcano, gallery, roots, Kula Kaï cave70396117 - The Baradla Show Cave in the Aggtelek National Park, Hungary, Hall of Pillars The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one of the major attractions of70396115 - The Baradla Show Cave in the Aggtelek National Park, Hungary Hall of the Giants, 125 m long and 55 m wide The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one70396113 - The Baradla Show Cave in the Aggtelek National Park, Hungary, a drapery The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one of the major attractions of Hungar70396112 - The Baradla Show Cave in the Aggtelek National Park, Hungary, sinter straws The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one of the major attractions of Hu70374282 - Speleology, caving, cave pearls (pisolites)70374272 - Speleology, caving, caver in gallery, Event de Peyrejal, Ardèche, France70374266 - Speleology, caving, speleothem, concretion, aragonite, Lozère (France)70396114 - The Baradla Show Cave in the Aggtelek National Park, Hungary The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one of the major attractions of Hungary with abou70374271 - Speleology, caving, speleothem, concretion, aragonite70396111 - The Baradla Show Cave in the Aggtelek National Park, Hungary, Hall of Pillars The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one of the major attractions of70396108 - The Baradla Show Cave in the Aggtelek National Park, Hungary, the cave river called Styx The Baradla Cave in Aggtelek National Park is part of the UNESCO world heritage site of the caves of the Aggtelek and slovak karst The cave is one of the major attr70374280 - Speleology, caving, large gallery with rimstone pools full of water, Grotte de Gournier (Isere, France)70374242 - USA, Hawaï, Caving, Lava tube, volcano, gallery, roots, Kula Kaï cave10306922 - View of Pamukkale in Aegean, Turkey10307167 - View of Pamukkale in Aegean, Turkey10307205 - View of Pamukkale in Aegean, Turkey10307206 - View of Pamukkale in Aegean, Turkey10307202 - View of Pamukkale in Aegean, Turkey10307204 - View of Pamukkale in Aegean, Turkey10307168 - View of Pamukkale in Aegean, Turkey10307225 - View of Pamukkale in Aegean, Turkey10307203 - View of Pamukkale in Aegean, Turkey