Experience history.

The exterior of G Cottage served as the exterior of Matheson Academy, the fictional private school the Locke siblings attend. The surrounding areas of the grounds (including F and H cottages) can also be seen. However, when the siblings enter the school, they are inside Casa Loma. 

Fun Fact: The show is set in the winter, but was filmed in the summer. Instead of using CGI, the crew added fake snow across the grounds. Many Humber students that were taking summer classes, showed up to see fake snow all around the campus!