The Klan Marches on Washington, 1925
The 1925 Klan parade, looking southeast down Pennsylvania Ave towards the Capitol. The tall tower on the right is the Old Post Office.
The Klan marched once again in 1926.
The ground-level and aerial photos of the parade looking from Freedom Plaza towards the Capitol is from the Library of Congress. http://www.loc.gov/pictures/resource/ppmscd.00046/?co=npco