<Li> Andrea Parker portrays Jessica DiLaurentis / Mary Drake, twin sisters . Jessica is the mother to Alison and Jason, while Mary is revealed to be the mother of Charlotte and Spencer . Mary was admitted to Radley Sanitarium for most of her life, but has now returned to Rosewood . During the fourth season, Mary kills Jessica and attempts to frame Peter Hastings for it . However, this is not revealed until season 7 . She comes back to Rosewood later, now allied with Archer Dunhill . In the nineteenth episode of season 7, she takes the blame for the death of Archer Dunhill so the Liars won't have to go to prison . In the season finale, it revealed that she escaped prison with the help of Mona so that she could ally with Alex Drake, her other biological daughter, Spencer's twin sister who is revealed as A.D </Li> <P> Rosewood is a fictional town in the United States state of Pennsylvania . It is the principal setting of the series and the books . The Liars live in this town along with most of the other characters . It contains many principal locations: the police station, the Rosewood High School, the church, the Rosewood Shopping Center, Hollis College, the Rosewood Community Hospital, the Rosewood movie theater, the mausoleum, the dental office, the Ophthalmology Cabinet, and the Rosewood Court . </P> <P> Virtually all these locations are actually exteriors on the backlot of the Warner Bros. studio lot in Burbank . Interior scenes are filmed separately on nearby soundstages . For example, different sides of the same building on the backlot are used for the entrances of the Rosewood police station and high school . </P> <Ul> <Li> Real towns: New York City, Cape May, Philadelphia, London, Hilton Head Island and Brookhaven </Li> </Ul>

Where is the tv show pretty little liars filmed