The doppelgänger chamber where the Monastery crew creates their 'gangers' from the flesh in episode 6x05 “The Rebel Flesh”.
Appears in 1 additional episode.
Also appears in “The Almost People”.
The Doctor, Amy, and the Queen are led into this control room after they discover the truth in episode 5x02 “The Beast Below”.
Amy, Vincent, and the Doctor get chased by the beast into this crypt where Vincent eventually stabs it with his easel in episode 5x10 “Vincent and the Doctor”.
UNIT Lab (interior)
Kate Stewart shows the Doctor what the various cubes are doing in episode 7x04 “The Power of Three”.
Vinder follows Bel's route and discovers Swarm and Azure using more people as energy sources in episode 13x05 “Chapter Five: Survivors of the Flux”.