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Old Faithful geyser blowing, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Tourists watching Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Erupting geyser and Old Faithful Inn, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser erupting in summer evening light, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser erupting in summer evening light, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The cone geyser called Old Faithful erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The cone geyser called Old Faithful erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Evening eruption of Old Faithful geyser with tree and snow, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Castle Geyser steaming, with Old Faithful erupting behind, in Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful, a cone geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The cone geyser called Old Faithful erupting, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful geyser under a starry sky, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Old Faithful Geyser, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sunrise eruption of Old Faithful geyser with stream, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sunrise eruption of Old Faithful geyser with stream, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Erupting Old Faithful Geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Sunrise eruption of Old Faithful geyser with stream, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

The Old Faithful Geyser at Calistoga, erupts 60 ft high every 30 minutes, with a pressure of 1000 lbs per square foot, Napa Valley, California, United States of America, North America

Old Faithful Geyser, erupts 60ft every 30 minutes, with pressure of 1000lbs per square foot, Napa Valley, California, United States of America (USA), North America

Castle and Sawmill Geysers in eruption in Old Faithful Geyser Basin in winter, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America (U.S.A.), North America

Winter eruption, Old Faithful geyser, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Crowds of spectators watching Old Faithful Geyser erupting, Upper Geyser Basin, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America

Detailed view of the discoloration caused by bacteria and algae on a geyser, Geyser Hill, Old Faithful Area, Yellowstone National Park, Wyoming, USA, North America

Detailed view of the discoloration caused by bacteria and algae on a geyser, Geyser Hill, Old Faithful Area, Yellowstone National Park, Wyoming, USA, North America

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Tourists in front of an Old Faithful geyser eruption, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Old Faithful feyser eruption, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Eruption of the Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Old Faithful feyser eruption, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Old Faithful feyser eruption, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Old Faithful geyser, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA

Old Faithful feyser eruption, Upper Geyser Basin, geothermal springs in Yellowstone National Park, Wyoming, United States of America, USA