Atlas › Horror filming locations › In the Mouth of Madness (1994)
Filming location · In the Mouth of Madness (1994)
R.C. Harris Water Treatment Plant, Toronto
The Art Deco waterworks on the Scarborough bluffs plays the exterior of the mental hospital where John Trent is locked up. It is a working treatment plant and the grounds are open as public parkland.
Source: set-jetter.com
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