Mystery

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Conspiracy theory
Nazca Lines
Bermuda Triangle
Crop circle
Area 51
Alien abduction
UFO
Unidentified flying object
Ufology
List of UFO sightings
Roswell UFO incident
Extraterrestrial life
Pyramid
Akhenaten
Aten
Amarna
Pyramid
Television Series
Ancient Aliens
Extraterrestrial
List of alleged extraterrestrial beings
Andromedans (extraterrestrial)
Greys
Dropa
Flatwoods monster
Kelly–Hopkinsville encounter
Little green men
Nordic aliens
Reptilians
The Sirius Mystery
Flying saucer
Close encounter
List of alleged UFO crashes
List of alleged aircraft-UFO incidents and near misses
UFOs in fiction
Extraterrestrial hypothesis
Kenneth Arnold UFO sighting
Ancient astronauts
Skeptical Inquirer
Aurora, Texas UFO incident
Coyame UFO incident
Height 611 UFO incident
Kecksburg UFO incident
Laredo, Texas UFO Crash
Rendlesham Forest incident
Shag Harbour UFO incident
Nommo
Sirius