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Claimed 1948 crash and recovery similar to Roswell, widely regarded by researchers as a hoax originating from a con artist's story.
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Reported UFO/debris event in Washington state days before Arnold's sighting; long since concluded to be a hoax.
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Pilot's 1947 sighting of nine fast-moving objects near Mt. Rainier that coined the term 'flying saucer'.
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Scandinavia experienced a wave of reports of rocket- and missile-shaped objects; largely attributed to meteors and early Soviet missile testing.
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US anti-aircraft batteries fired over a thousand rounds at a perceived aerial intruder over the city; an Army review attributed the alarm to a weather balloon.
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Allied and Axis pilots reported mysterious lights following aircraft during WWII; largely attributed to St. Elmo's fire, flares, or enemy tech.
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Local legend claims a mystery airship crashed and its pilot was buried in 1897; historians regard the story as an unverified, likely fabricated hoax.
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Wave of 'mystery airship' sightings across the US Midwest and West predating powered flight; researchers attribute most reports to hoaxes and misidentification.
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Massive 1908 Siberian explosion sometimes claimed by fringe theorists as an alien craft mishap; mainstream science attributes it to an airburst meteor or comet.
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Broadsheet account of dark spheres appearing to 'battle' in the sky over Switzerland; also considered a probable atmospheric optical effect.