Armory Square Hospital

The Armory Square Hospital formally known as the District Armory or Armory of the District of Columbia was a military hospital for the Union Army located on the National Mall in Washington, D.C., which operated from 1862 to 1865. It stood at the intersection of 6th Street SW and B Street SW (now Independence Avenue) between the Smithsonian Castle and the Capitol. The 12 wards extended across the Mall, all the way to the Canal. Today, the National Air and Space Museum stands in its place.

Hospital data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).