This urban legend has survived decades despite being thoroughly debunked by top military brass.

The Philadelphia Experiment. October 28, 1943. The day the U.S. Navy allegedly cracked time travel, teleportation, and invisibility—or so the story goes. What really happened was far more terrifying.

Much has been made of unidentified flying objects over the years, including a testimony before Congress last year. But what about unusual floating objects? One supposed supernatural event focuses on ...