Alison DiLaurentis from ‘Pretty Little Liars’ went missing 17 years ago today. Within the show's fictional timeline, Alison DiLaurentis vanished during Labor Day weekend on September 1, 2009, in the fictional town of Rosewood, Pennsylvania, an event that became the entire foundation of 'Pretty Little Liars.' That night, Alison and her four closest friends, Spencer Hastings, Aria Montgomery, Hanna Marin, and Emily Fields, gathered in a barn for a sleepover, drinking and hanging out before drifting off to sleep. Sometime during the night, Alison disappeared without a trace, with Spencer recalling she'd gone looking for her and thought she'd heard a scream in the dark. Her disappearance became national news, framed in-universe as the story of a beautiful, popular teenager from a wealthy family who vanished just before summer's end. The mystery stayed unsolved for a full year until a body was discovered buried in the backyard of the DiLaurentis family home, precisely where new homeowners...