A team of astronomers have found a mysterious object in the distant universe that could be dark matter or an inactive smaller ...

America is no stranger to a host of strange and unexplained discoveries that span from ancient artifacts (hoax or history?) to baffling natural phenomena to conspiracy theories about places as benign ...

The Roman Empire built 73 miles of wall to fortify its northern border in Great Britain. In AD 122, the Emperor Hadrian ordered its construction, and it remained the empire's border fortification for ...

The persistent human fascination with extraterrestrial life and the fundamental question of whether we are alone in the universe has driven countless investigations, theories, and debates throughout ...

For years, scientists staring at Mars through the eyes of orbiting spacecraft noticed something strange: a mysterious signal ...

"Massachusetts' Bridgewater Triangle is America's leading hotspot for all things unexplained," the Discovery Channel says.