This is the ruins of Lock 38 of the Chesapeake and Ohio Canal in Sharpsburg, Maryland.
This is Howison Hill, the sight of a Civil War embankment, at the Fredericksburg National Battlefield in Fredericksburg, Virginia.
This is the Old Stone House in Washington D.C. Located in Georgetown, it is the oldest standing structure in the District of Columbia.
This is Quantico Creek flowing through Prince William Forest Park in Triangle, Virginia.