There are three significant multi season locations. All easy to access and a trip to see all three can be done in a day.
Vancouver Central Library , which was the site of the Shopping Mall blue balloon attack. It is at 350 West Georgia Street, Vancouver, B.C. V6B 6B1 This is in downtown Vancouver and very easy to visit.

Fort Salem. This would need half a day to itself. It is built on a hillside, you need good walking boots and an ability to handle hills. Or a good mobility cart.
Fort Salem is Riverview Hospital, at 2601 Lougheed Hwy, Coquitlam, BC V3C 4J2

The map has east at the top and west at the bottom.
Crease Building, at the right of the map, is Circe Barracks.

East Lawn Building, at the top of the map, is General Alder’s Office.

Centre Lawn Building, in the middle on the left of the map, is the Operations building.

The West lawn area, unlabelled at the bottom of the map, is where the Raylla trees are as well as the Samhain procession and campfires, the salva scene and the Witchplague / Hearst.

The other major location is Vancouver film studios. A lot of filming was done there in season 2 and 3. Some filming was done there in season 1. It is not possible to go into the studios, but they can be seen from the outside.
Vancouver Film Studios is at 3500 Cornett Road Vancouver, BC V5M2H5
If you are travelling on the Millennium line trains between Rupert station and Gilmore station, the train passes very close to the studio and you can get a good view from the south side of the train.
