People have flocked to Johnston Canyon  since the prospector it was named for staked a claim nearby in the 1880s.  Today’s trail includes walkways suspended from the cliffs—appreciate Banff’s most popular canyon from deep within. Crawl through a natural tunnel for a point-blank view of the Lower Falls. Near the base of the 30 m (98 ft.) high Upper Falls, the trail takes you creekside opposite a travertine wall. This mass of limestone was precipitated from the lime-rich water by algae. That’s right; millions of single-celled creatures created a cliff.  Birders enjoy this outing for the opportunity to see dippers in the creek, and warblers and flycatchers in the forest. Johnston Canyon is one of three Alberta nesting sites for black swifts.