The Blair Witch Project filmed at Griggs House, Ellicott City. The old house used in the film was rescued from demolition and now sits in a state park.
Probable Named in published production coverage; the coordinate is the place itself, checked against a gazetteer.
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Venture keeps every scene location on one map, sorted by how far you'd have to walk. Open it in Ellicott City and it tells you what was shot around you, how to get there, and whether you can actually go in.
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