Civil War Sites~Washington D.C.
Ford’s Theatre: http://www.fords.org/home
The Petersen House: https://www.nps.gov/foth/the-petersen-house.htm
Center for Education and Leadership (Across from Ford’s Theatre, adjacent to the Petersen House) includes four floors of displays about Lincoln’s presidency and legacy: http://www.fords.org/home/plan-your-visit/daytime-visits-fords-theatre/center-education-and-leadership
Lincoln Memorial: https://washington.org/DC-guide-to/lincoln-memorial
The International Spy Museum (Contains a nice display on Civil War spies): http://www.spymuseum.org/
Smithsonian National Museum of American History: http://americanhistory.si.edu/
Arlington House (Home of Confederate General Robert E. Lee): https://www.nps.gov/arho/index.htm
United States Capitol and grounds: https://www.visitthecapitol.gov/