Ancient Aliens

Around the world, certain sites combine perplexing ancient clues to potential alien visitation with a flurry of present-day UFO activity.

Ancient myths and legends from around the globe tell of incredible beings with supernatural powers. Do these stories actually describe alien visitors?

Ancient underwater cities can be found around the globe, but could they be the ruins of unknown civilizations -- or proof of extraterrestrials?

Experts decide if a subterranean Turkish city, a sacred Yucatan temple and a hidden Ecuadorian cave are proof of aliens living with ancient humans.

If ancient aliens visited Earth in the remote past, could they have given us advanced technology, passed down through human history?

Many of today's cutting-edge devices seem to appear in ancient artwork. Did extraterrestrial visitors beat modern science to the punch millennia ago?

Even before the Bible, legends told of winged messengers from the sky. But could tales of angels really be accounts of visitors from space?

Megalithic feats of pre-civilization architecture are examined to determine if they were built by extraterrestrial life.

Theorists explore aliens potentially causing ancient natural disasters and using the events to advance human evolution.

Accounts of alien visitors imply that celestial beings may have influenced the lives of Moses, Joan of Arc and other key figures throughout history.