Amelia Earhart
Amelia Earhart was the first woman to fly solo across the Atlantic Ocean. However, in 1937, on the last leg of her trip around the world, Earhart's plane mysteriously vanished over the Pacific Ocean. Nobody knows what happened to Earhart, her navigator Fred Noonan, or her aircraft.
Area 51
This top-secret Air Force facility is located in the deserts of Nevada. Conspiracy theorists believe that Area 51 is the storage site for alien UFOs that crash-land on Earth. It is also rumored that the military base specializes in the underground research of alien technology.