#5 An unsolved mystery from the United States.
In 1971, a man calling himself D.B. Cooper hijacked a Boeing 727 during a flight from Portland to Seattle. He calmly demanded $200,000 in cash and four parachutes, released the passengers once he got what he wanted, then ordered the crew to take off again at low altitude. Somewhere over the Pacific Northwest, in the middle of a storm, he lowered the rear staircase and parachuted into the mountainous, heavily forested terrain, at night no less, with the money.
No one knows who he was, where he landed, or whether he even survived the jump. Despite one of the most extensive FBI investigations in history, Cooper was never identified or captured, and the case remains the only unsolved act of air piracy in the United States.
