Washington DC historic sites and buildings are among the most famous landmarks in the world. The most prominent landmark buildings are located downtown and include, the Library of Congress, National Archives, The White House, United States Capitol, United States Supreme Court and Ford's Theatre and Lincoln Museum. Other landmarks in the District include; the National Shrine Of The Immaculate Conception, Old Post Office, and the Washington National Cathedral. The city features many parks and open spaces such as the Lincoln Memorial Reflecting Pool, The Tidal Basin and Rock Creek Park.
The Pentagon is located across the Potomac in Arlington, Virginia. Also in Northern Virginia, Old Town Alexandria features numerous landmark and historic buildings including, Carlyle House, Christ Church, Ramsay House (Alexandria Visitors Center), Theodore Roosevelt Island, Gadsby's Tavern, Lee-Fendall House, Lloyd House Alexandria Library, The Lyceum, River Farm, and The Torpedo Factory Art Center.
Down the George Washington Memorial Parkway from Old Town Alexandria is Mount Vernon the Estate of George Washington. Near Mount Vernon several other historic sites are located including; Gunston Hall, Woodlawn, Frank Lloyd Wright's Pope Leighey House, and Pohick Church. Also in Northern Virginia are the Sully and Manassas National Battlefield.