Mysterious legends and crumbling ruins are all that is left of our planet's lost worlds. But could there be proof of ancient alien visitors hidden among the artifacts of ...

From The History Channel : If ancient aliens visited Earth, can evidence of their existence be found in the mysterious structures that still stand throughout the world? I ...

From The History Channel : Ancient underwater cities can be found around the globe, but could these aquatic worlds be the ruins of unknown civilizations--or even proof of ...

From The History Channel : Mysterious places can be found around the Earth, and, inexplicably, UFOs are often sited near these mystical areas. Planes and ships unaccounta ...