You'll probably spot St. Marys Cathedral across town before you actually find this grand religious building. Take a seat inside if it's open or just admire the facade from outside.
This Southwest Calgary principal church is a good place to kick off your day of sightseeing. There's loads to enjoy in the area, including Calgary Tower, University of Calgary, and Scotiabank Saddledome. Take your time at St. Mary's Cathedral before hitting up these other fine attractions.