From the Great Pyramid of Giza to mysterious structures in Sudan, Mexico, the Canary Islands, and beyond, pyramids have appeared across civilizations separated by thousands of miles and centuries of history. Explore theories about their purpose, remarkable discoveries hidden beneath them, and the controversial possibility that ancient cultures shared knowledge across vast distances. Plus, investigate extraordinary claims of a massive pyramid buried beneath Alaska—and pyramid-like formations photographed on Mars. #TheUnxplainedZone New Episodes Fridays 9/8c Watch full episodes of The UnXplained and stay up to date on all of your favorite The HISTORY Channel shows at history.com/schedule. Check out more full episodes of The UnXplained on YouTube here- https://bit.ly/TheUnXplainedS5 and on Google Play! https://bit.ly/TheUnXplainedS5GooglePlay Subscribe for more from The UnXplained and other great The HISTORY Channel shows: http://histv.co/SubscribeHistoryYT Watch more The UnXplained on YouTube in this playlist: https://histv.co/UnXplainedYT Find out more about the show and watch full episodes on our site: https://histv.co/unxplained Check out exclusive The HISTORY Channel content: History Newsletter - https://histv.co/newsletter Website - https://histv.co/History Facebook - https://histv.co/Facebook Twitter - https://histv.co/Twitter From the producers of Ancient Aliens and The Curse of Oak Island comes The UnXplained, a one-hour, non-fiction series that explores the world’s most fascinating, strange and inexplicable mysteries. Hosted and executive produced by Golden Globe and Emmy Award-winning actor William Shatner (Star Trek, Boston Legal) each episode will feature compelling contributions from scientists, historians, witnesses and experiencers—each seeking to shed light on how the seemingly impossible actually can happen. HISTORY® is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platforms. The network’s all-original programming slate features a roster of hit series, premium documentaries, and scripted event programming.