The Cave in Banff is the birthplace of Parks Canada. That in itself makes it worth a visit. An hour is enough to visit this site, but the entrance fee is low.
The Cave really was a magical place, very beautiful. I also enjoyed learning more about the very small and endangered snail that lives in these sulphurous waters.
I was really impressed by the beautiful video presentation of Parks Canada. Exceptional!
Cave and Basin National Historic Site, Cave Ave. west of downtown Banff, Banff, Banff National Park, Alberta, Canada
Visited August 2015. You can find my review about Cave and Basin National Historic Site also on TripAdvisor.