Landmarks & buildings
Cathedral of the Transfiguration
Former Slovak Greek Catholic cathedral
Wikipedia names Cathedral of the Transfiguration as where 1 film or series was filmed; its page links to the sentence that says so. Wikidata records no shoot here yet.

Filmed here, per Wikipedia
Wikipedia says these were filmed in Cathedral of the Transfiguration. Each title’s page links to the sentence that says so.
In the Mouth of MadnessHorror film1994
Named here by Cathedral of the Transfiguration’s own Wikipedia article
Cathedral of the Transfiguration’s own Wikipedia page says these were shot here. Not on the map: each title’s page quotes the sentence so you can check it.
In the Mouth of MadnessHorror film1994
Filming locations nearby
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Landmarks & buildings
Frederick Horsman Varley Art Gallery
Canada · 5 km south-east
Art museum in Ontario, Canada
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Streets & squares
Main Street Unionville
Canada · 6 km south-east
Canadian street
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Towns & cities Richmond Hill
Canada · 6 km south-west
City in Ontario, Canada
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Towns & cities Unionville
Canada · 6 km south-east
Neighbourhood of Markham, Ontario
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Towns & cities
Oak Ridges
Canada · 9 km north-west
Human settlement in Richmond Hill, Ontario, Canada
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Towns & cities
Markham
Canada · 10 km east
City in the Greater Toronto Area, Ontario, Canada
What Wikipedia says about Cathedral of the Transfiguration
One sentence quoted word for word from Wikipedia, with the production it describes and a link to the article it comes from.
“The exterior of the cathedral was used in the 1994 movie In the Mouth of Madness, where it portrayed the Black Church located in Hobb's End.” Wikipedia