From the lost city of Atlantis to the mystery of the Nazca Lines, the world is filled mysterious and unexplained occurrences.

We spoke to Giorgio A. Tsoukalos, an Ancient Astronaut theorist, writer and host of the Ancient Aliens TV series,  who is a proponent of the idea that ancient alien astronauts interacted with ancient humans.

He joined us to examine clues that could prove a possible extraterrestrial connection within some of the world’s greatest unsolved mysteries.