<p>Visitors to Yellowstone National Park watch the eruption of the Grand Geyser in the park's Upper Geyser Basin. Established on March 1, 1872, in Wyoming, Idaho, and Montana, Yellowstone contains the greatest concentration of the world’s hot springs and geysers.</p>

Grand Geyser, Yellowstone, Circa 1912

Visitors to Yellowstone National Park watch the eruption of the Grand Geyser in the park's Upper Geyser Basin. Established on March 1, 1872, in Wyoming, Idaho, and Montana, Yellowstone contains the greatest concentration of the world’s hot springs and geysers.

Photograph by Stereo-Travel Co., Library of Congress

Enchanting Vintage Pictures Show National Parks When They Were Young

When Congress created the National Park Service in 1916, Americans were just beginning to discover what writer Wallace Stegner called "the best idea we ever had."

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