Flying Saucers Over the Capitol and White House
The hot summer of 1952 witnessed some bizarre lights floating over the District. Evidently for many nights in July, sightings were reported of up to seven lights flying around the night sky, including over the Capitol Building. Radar operators claimed they saw strange blips on their screens and flight attendants on planes approaching National Airport said they saw lights above their airplane.
Below is a cartoon recounting the story. We dug this up at the National Archives.