Here are some Halifax photos I took last summer. I don't think they made it into this thread yet. They weren't really intentional "canyon" shots, but I like the mix of older buildings and highrises:
Granville Street
Hollis Street. The building on the left was not quite finished when I took this photo. A new 23 storey building is being built right now on the left side of the street near the end of the highrise buildings so this will be slightly more canyon-like in a couple of years:
Close up of some older buildings on Hollis:
I didn't take any shots right down Barrington, but it's got some nice stretches of 4-8 storey streetwalls plus some highrises
Not quite a canyon but some of the narrower streets are pretty interesting: