Discovery of Old Faithful

Date: September 18, 1870 • Location: West Yellowstone, United States

Nathaniel P. Langford of the Washburn–Langford–Doane Expedition first observed a geyser in the Wyoming Territory erupting at regular intervals, naming it Old Faithful (video featured).

Nathaniel Pitt Langford was an American explorer, businessman, bureaucrat, vigilante, and historian from Saint Paul, Minnesota who played an important role in the early years of the Montana gold fields, territorial government and the creation of Yellowstone National Park.