Tommaso Boddi/Getty; ABC FAMILY/ANDREW ECCLES Pretty Little Liarsis turning 15! Lucy Hale shared behind-the-scenes photos and videos from the set Hale and her costars have continued to keep in touch following the show's 2017 conclusion Lucy Haleisn't keeping any more secrets from the set ofPretty Little Liars, in honor of the show's 15th anniversary. Hale, 36, shared anInstagrampost of candid behind-the-scenes photos and videos from the Freeform show. In the Monday, June 16, post, the actress wrote, "happy 15 years to PLL 🤫 the nostalgia!!""Some of these photos are so low quality but it really was a different time lol," Hale continued. "The last slide is a video I stumbled on and didn't even realize I had. Just a small, but not uncommon moment while filming this show 📱🔥." Lucy Hale/Instagram "This experienced changed my life and I will always be grateful to everyone involved. And to all of you, who made this one incredible ride," Hale, who starred as Aria Montgomery on the series, continued. "Thank you for keeping this alive for so many years and I know it'll be one that people keep discovering. I want to hear all the crazy A theories you had in the comments 💋." Pretty Little Liars, which ran on the CW from 2010 to 2017, centers on a group of teenage girls in small town Pennsylvania as they navigate their best friend's disappearance — and possible murder — with plenty of small town melodrama on the way, including being stalked by an ominous presence that goes by "A." Never miss a story — sign up forPEOPLE's free daily newsletterto stay up-to-date on the best of what PEOPLE has to offer, from celebrity news to compelling human interest stories. Hale'sPLLcast mates also celebrated the anniversary of the show's release in the comments.Troian Bellisario, who played Spencer Hastings, wrote, "Still can't believe it! Miss you sweet goose!"Sasha Pieterse, who played the disappeared Alison DiLaurentis, wrote, "Love you so much!" Lucy Hale/Instagram (2) Some fans followed Hale's directions in sharing their "A" theories in the comments. One user wrote, "Aria should have been A for so many reasons and I SWEAR that's where it was headed bc there were so many clues and signs!!!" In the years sincePretty Little Liars, Hale acted inTruth or DareandFantasy Island, and mostly recently appeared inF*** Marry Kill. Read the original article onPeople