Laser Scanning Reveals Cathedral’s Mysteries | National Geographic

Tech-savvy art historian Andrew Tallon uses lasers to unlock the builders’ secrets behind the construction of the National Cathedral in Washington, D.C. ➡ Subscribe: About National Geographic: National Geographic is the world’s premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what’s possible. Get More National Ge