In 1967, the government of Ontario unveiled the Post One Monument, commemorating the Canadian Centennial. The monument is a stainless-steel plate, , mounted on a flat concrete slab. A bronze map of the country is affixed to the stainless steel plate. Similar memorials are also situated in the capitals of other Canadian provinces, with each of these monuments also having inscribed the distance from the memorials to the various provincial capitals. Surveyor tools such as survey markers were also sculpted onto the plate. In addition to commemorating the centennial the monument also holds a time capsule scheduled to be opened in 2067.