In three decades at National Geographic, Ann Williams has been an eyewitness to some of the greatest archaeological treasures of the last century. She was just outside on the dark and stormy night when they loaded King Tut’s mummy into a CAT scanner. She examined the fibers of an ancient woven blanket shrouding an Incan teenager, who’d been sacrificed to the gods. She documented the bowls and baskets left behind as an entire Alaskan Yupik village fled an attack.