Corrosion - Mr. Sable's now-abandoned site featuring Calgary-based explorations.
Drains of My City - Urban exploration in Edmonton, focussing on drains but with some other sites as well. One of the best.
Urban Artography - Photography-oriented site featuring text updates and photo galleries of tunnels, bridge rooms, construction, abandonments and more.
Urban Exploration Alberta - Site of a Calgary-based group of explorers of drains, tunnels, rooftops, mines, abandoned buildings and more.