Beaver, PA, United States
Fort McIntosh. The first U.S. military post north of the Ohio. Located on River Road and occupying the area between Bank, Insurance, and Market Streets. Built in 1778 and scene of Treaty of Fort McIntosh in 1785; also a survey base. Abandoned 1790-91.
Listen to the audio guide for Blue plaque № 28432 Free on WIP — starts by itself when you arrive, even with the screen off