Maybe not really a canyon but I liked this Barrington Street shot from Halifax. It is a mix of highrises and older 3-6 storey buildings, mostly heritage buildings that hopefully will never be redeveloped into highrises. A portion of this street is under viewplanes which restrict development down to 6 floors or so to preserve views.
There's a gap visible on the left (where you can see a purple tentacle on a mural), the Press Block development site.
Source