While Calgary is not a very old city there is a selection of older architecture downtown.
Here is the Molson's Bank building built in 1911.
Nikon D750 1/80 sec. f/9 ISO-100 at 22mm
Hudsons's Bay building built in 1913.
Nikon D750 1/200 sec. f/10 ISO-100 at 14mm
Doorway to a building along Stephen Ave in downtown Calgary built between 1911 and 1913.
Nikon D750 1/200 sec. f/5 ISO-100 at 24mm