Landmarks within the city include the
- Market Square
- Robert E. Lee's boyhood home
- The Torpedo Factory Art Center, and
Other sites of historical interest in the city include the
- Alexandria Black History Resource Center
- The Fort Ward Park and Museum, and
- The Alexandria Canal lock re-creation at Canal Office Center.
Interesting sites with Alexandria postal addresses but outside of the city limits include
- Washington's Grist Mill and the Mount Vernon Estate.
In 1830, John Hollensbury's home in Alexandria was one of two homes directly boarding an alleyway that received a large amount of horse-drawn wagon traffic and loiterers. In order to prevent people from using the alleyway, Hollensbury constructed a 7 feet (2.1 m) wide, 25 feet (7.6 m) deep, 325-square-foot (30.2 m2), two story home using the existing brick walls of the adjacent homes for the sides of the new home. The brick walls of the Hollensbury Spite House living room have gouges from wagon-wheel hubs and the house still is standing and occupied.