Vowell-Smith House
GPS Coordinates: 38.8012650, -77.0462350
Closest Address: 510 Wolfe Street, Alexandria, VA 22314

Here follows an excerpt from the Clio Foundation website about the Vowell-Smith house as written by Ben M.:
Introduction:
This large, three-story Italianate residence—one of the biggest ever built in the city—is the historic Vowell-Smith House. Erected in 1854, it was also known as the Wolfe Street Hospital when the Union Army used it as a military hospital during the Civil War. It was built by its first owner, Francis L. Smith, on land he inherited from his father. Smith was a prominent lawyer best known for representing former Confederate General Robert E. Lee after the war. The home is a private residence today but can be easily admired from the street. Interesting features of the house include a cornice (the ornamental moulding running along the roofline) with stepped brackets, and, on the front facade, doubled windows and arched doubled windows on the third floor, and a large front entrance with an arched doorway. An ornate iron fence surrounds the home.
Backstory and Context:
Soon after the Civil War began in 1861, Smith, who was a southern sympathizer, and his family fled to the Confederate capital city of Richmond. This allowed the Union seize the home (and others in the neighborhood) to use for military purposes. At first, the home became the headquarters of military Governor John Slough, who made a name for himself leading a Union force to victory in a confrontation with a Confederate force in New Mexico (the decision to attack was his, defying orders of his superiors; President Lincoln, who was desperate for some good news, disregarded this defiance and appointed Slough to the position).
As noted above, the home eventually became a hospital with room for 100 soldiers. Apparently, some of these men carved their names into the woodwork. After the war, Smith returned and converted it back to a home. It was from here that Smith tried to advise Lee on how to recover property the Federals seized. This property is what is now Arlington National Cemetery.