The site of the first Alexandria railroad roundhouse, this development provided the opportunity for archaeologists to research the Orange and Alexandria Railroad as well as the effects of the Civil War. Captured by Union troops in order to provide a supply hub for the southern campaign, the blocks around the roundhouse were enclosed with a wood palisade for the United States Military Railroad. The foundations of the home used by the Union as a hospital and a massive octagon-shape privy were discovered. The excellent preservation in the water-logged privy permitted the recover of leather boots, horse crop, food remains and hundreds of ceramic and glass artifacts associated with the Civil War soldiers.