this roman catholic basilica – “a roman public building,” in case you were wondering what that meant – perched atop the northern slope of mont-royal first appeared in 1924, but construction wasn’t actually completed until a whopping 43 years later in 1967. this wasn’t even the first building; a small chapel was first constructed in 1904 on the side of mont-royal. the oratory is also one of the national historic sites of canada.