Saturday, Dec 7 2013 by kjfitzHere are ten U.S. National Historic Landmarks in the state of Maryland… © Bing MapsBaltimore Harbor Inspection Tugboat © Bing MapsClara Barton National Historic Site © Bing MapsBollman Suspension Truss Bridge © Bing MapsCarrollton Viaduct, World's Oldest Railroad Bridge Still in Use © Bing MapsUnited States Sloop of War Constellation © Google MapsFort Frederick © Bing MapsHomewood House © Bing MapsLightship Chesapeake (LV-116) © Bing MapsMontpelier Mansion © Bing MapsGeorge Washington's Mount Vernon Plantation (Comments) Like Tweet Share Pin Talk