4301 W Braddock Road, Alexandria VA 22304
This earthen fort, one of the 68 that ringed the Federal capital during the war, has been restored and interpreted. A nearby museum offers excellent Civil War exhibits relating to Alexandria's war-time experience and other topics. This is the place to get oriented for a tour of Civil War fortifications in the Washington DC area.
Museum open 10 am–5 pm Tuesday–Saturday, noon–5 pm Sunday. Free.
Related: Washington DC sites