Upper Geyser Basin, Yellowstone Park, Wyoming, c1908.
U.S. GEOG FILE - National Parks and Monuments--Yellowstone--Geysers [P&P]
REPRODUCTION NUMBER: LC-USZ62-91086

March 1, 1872 - Yellowstone National Park is proclaimed.
It is the first national park in the world.

Yellowstone contains half of the world's known geysers.
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