Placed on each measured mile around the District of Columbia in 1791 and 1792, the Boundary Stones of Washington are our oldest federal monuments. This site has the history of the stones, the location of each, and a map. Click on the map markers to see a photograph of each stone. This one is at 901 Southern Avenue, and is in better shape than most. Link -via Metafilter
Placed on each measured mile around the District of Columbia in 1791 and 1792, the Boundary Stones of Washington are our oldest federal monuments. This site has the history of the stones, the location of each, and a map. Click on the map markers to see a photograph of each stone. This one is at 901 Southern Avenue, and is in better shape than most. Link -via Metafilter