What really happened in Roswell in 1947? Here’s what you need to know about the UFO myths and alleged cover-ups.
They don't always come in peace, but they often come in outstanding outfits.
From flying saucers over Washington to a WWII battle in Los Angeles, we count down five of the most famous UFO sightings in history outside of Roswell.
It's been a hot summer for news of what (or whom) we might one day encounter in outer space — and Josh Gates will join the conversation this fall with Expedition Unknown: Hunt for Extraterrestrials.