Fascinated by the supernatural all his life, Cliff Simon is now taking his expertise on a personal mission, deep into the murky world of the paranormal in Travel Channel’s new six-part series. Read more.
About the show
Adventurer and survivalist Cliff Simon explores paranormal mysteries in some of the world's most extreme and challenging environments. Along the way, scientists, shamans and historians provide clues that shed light on dark secrets that defy explanation.
Into the Unknown- Video Highlights
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Cliff Simon follows the possible pathway of the night marchers through a cave.