Fort Stanton (Washington, D.C.)
Fort Stanton was a Civil War-era fortification constructed in the hills above Anacostia in the District of Columbia, USA, and was intended to prevent Confederate artillery from threatening the Washington Navy Yard. It also guarded the approach to the bridge that connected Anacostia (then known as Uniontown) with Washington.
Source: Wikipedia — Fort Stanton (Washington, D.C.) (CC BY-SA 4.0)