Yellowstone NP - Upper Geyser Basin

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The star attraction in this geothermal realm that is home to the world’s highest concentration of geysers is iconic Old Faithful. But visitors who stroll along the basin’s boardwalks and trails also marvel at Castle Geyser eruptions and gaze into the piping-hot water in Heart Spring, named for its shape resembling a human heart.

Check out the entire Yellowstone National Park Collection!