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Giant Geyser is the central geyser of the Giant Group, which includes Mastiff Geyser and Bijou Geyser. In a “normal function eruption,” only Giant erupts, which means it will usually be shorter in terms of time and plume size, attaining 150 feet. Meanwhile, during a “Mastiff function eruption,” where Mastiff erupts alongside Giant (and sometimes Bijou), making Giant rocket upwards …

Early expeditions were the foundation for the signing of the Act of Dedication on March 1, 1892, establishing Yellowstone National Park!

October 10, 1870: Truman Everts was found in Yellowstone National Park after being lost for over a month.

Grotto Geyser is, hands-down, one of the most unusual thermal features in Yellowstone National Park.