Nick Pope, a frequent 'Ancient Aliens' guest and former UK Ministry of Defence official, has died after a battle with cancer.

See tributes from show, his wife, and more.

Pope worked in the U.K.'s Ministry of Defense for decades, covering a range of areas from defense policy to unidentified ...

An extraterrestrial misunderstanding led to a grave-robbing bonanza at the detriment of valuable Peruvian heritage.

Unveiling the truth behind the ancient alien theory: Explore the origins, questionable evidence, and the lack of proof ...