The Unholy was filmed in Massachusetts, United States of America.
Museum of the Clinton Historical Society - The Holder Memorial,
In movie
Scene where Gerry Fenn attends the press conference.
Real
Scene was shot According to Clinton Historical Society posts, the scene should be recognizable to people familiar with the building because the photos on the wall were not removed during filming.
Clinton
Martha-Mary Chapel
In movie
Scene where Alice is visited by the Virgin Mary and can suddenly hear, speak, and heal the sick.
Real
Scene was shot The Wayside Inn's Martha-Mary Chapel was named Our Lady of the Assumption for filming of the horror movie "The Unholy" in March 2020.
The Martha-Mary Chapel accomodates up to 150 seated guests and was built by Henry Ford in 1940. It has long been recognized as a historic landmark and national treasure and has been a setting for the perfect New England chapel in many motion pictures.
Sudbury