The Thornhill Lodge

The Thornhill Lodge of the Hastings is located in a wooded area near Rosewood. "A" used it as a meeting place with the Liars.

Season 3
The Lodge emerges for the first time on in "A Dangerous Game", as Spencer her friends to a party, the family invites, which turns out as a meeting place with "A". Later in the episode, the Liars and Mona of "A" is included in the lodge. Finally, the building is lit by "A". Escape after Mona and the girls could, Hanna sees the red coat and identified him as Alison. Also, Spencer and Mona have seen Ali as red coat.

Season 4
The girls come back here to look for clues.