Shawn and Gus are driven into the base by Ewan O'Hara in episode #410 "You Can't Handle This Episode".
The team talk to the head of the mental institution after a patient escapes in episode #715 "Psych the Musical".
Lance creates a distraction with the police so the team can sneak inside the prison in episode 4x18 "Eleven-Fifty-Nine".
Diggle follows a tip on his brother and finds him in an abandoned building in episode 4x20 "Genesis".
Diggle wakes up tied to the ceiling and is tortured by his brother in episode 4x20 "Genesis".
Liv and Clive talk to Jason at the mental hospital where he is incarcerated in episode 1x10 "Mr. Berserk".
Hospital where Olivia is taken after she comes back from the other side in episode #201 "A New Day in the Old Town".
The Fringe team goes to interview Greg Leiter about his breakdown at his office in episode #205 "Dream Logic".
Olivia is held in an abandoned hospital by David Jones in episode #414 "The End of All Things".
The vampire who bit Vanessa crawls out of the body disposal chute in episode 1x01 "Help Me".
Axel goes searching around the military base in episode 1x08 "Little Thing".
Raimy is briefed on the skeleton found in the swamp in pilot episode.
Young Raimy brings Frank the ham radio in the hospital where he is being treated for his gunshot wound in pilot episode. Young Eva is treated at the hospital in episode 1x04 "Bleed Over".