Here is a fairly cheesy local news spot about a fascinating artifact--a Roman brick found during excavations at Fort Vancouver. And it has paw prints!
This article from the Atlantic, 1 Kitty, 2 Empires, 2,000 Years: World History Told Through a Brick does a better job explaining the discovery of the brick, its likely origins, and how it came to the other side of the world in the fur trade era. What the author misses in the story of the brick, I think, it the reason it was saved. Though the early inhabitants of Fort Vancouver did indeed order bricks all the way from England, this seems to be the only Roman brick in the lot. I think it was far more likely carried as a curio, valued for its great age and the ancient footprints.