While in Thunder Bay, I paid a visit to the former Saskatchewan Wheat Pool 4A and 4B elevators on Shipyard Road by the waterfront. I have no idea which elevator is 4A and which is 4B. I went in both and climbed onto the roof of the red one. It’s possible to climb the white one, too, but the owners have removed all the metal landings in the stairwell, which means you have to climb over each railing all the way up. Since I was carrying a backpack full of gear, a camera, and tripod, I opted for the easier climb.
To be clear, the fact that the grain elevators are abandoned doesn’t mean that entering them stops being a trespass. But given that the elevators are visually arresting, trespass seems like a minor matter.