Washington D.C. UFO Invasion, 1952
The most spectacular UFO sighting in history.
The Washington DC sighting of July 1952 is considered to be the most spectacular UFO sighting in history and has never been completely cleared up.
The airspace above the US capital is normally restricted to aircraft, as most of Washington airspace is restricted to an altitude of 18,000 feet. This apparently did not prevent the luminous objects from flying over the Capitol in impressive formation.