A strange UFO sighting in Susa Valley, Italy, leads to the construction of Sacra di San Michele, and according to theorists, ...

Stacker compiled a ranking of cities with the most UFO sightings in Massachusetts using data from the National UFO Reporting Center.

In 1977, Brazil witnessed mysterious UFO encounters known as 'Chupa-Chupa', involving unexplained injuries and a military ...

Today marks 79 years since the U.S. first started seriously worrying there might be something "out there." But was it the ...