The Loch Raven Dam UFO (1958)
On October 26, 1958, two friends saw a whitish, egg-shaped object roughly 30 metres wide hovering over a bridge at the Loch Raven Reservoir in Maryland. Their car stalled about a hundred metres from the object. After 45 seconds, it flashed brilliantly and shot straight up with a dull roar, leaving the witnesses with reddened skin on the side facing it.
Witnesses
2 young men
Why it endures
An official US Air Force investigation filed as "unidentified" in the Project Blue Book files — a rare verdict, reserved for a minority of cases.
Official version (contested)
Blue Book concluded "unidentified." Radioactivity traces were measured on site but attributed to a natural radium vein.