I'm still trying to find more filming locations and as I find them, I will add them. :)
All of these locations are in Ontario, Canada.
Cosa Loma - 1 Austin Terrace, Toronto : The castle is open daily to the public. The front entrance was St. Agnes.
Coppins Corners: In the township of Uxbridge on a side road off of Highway 21. Lantern Hill. This house is privately owned. Respect their privacy and don't do things that you wouldn't want someone to do on your property. :)
Dundas Valley Conservation Area - Ancaster : The Trail Centre inside a historic railway station is the Bright River and Port Borden stations.
Greenwood : The scene that Jody "yells" at Aunt Irene was filmed on the main street. Greenwood is on Highway 7, outside of Pickering.
Whiteher - Hamilton : The mansion is in downtown Hamilton. It is open in the afternoons all year. The parlour was Evelyn's bedroom. The dining room was the Morrow dining room. The front hall and stairway were used as well.