Ten minutes from the town of Canmore, Grotto Canyon can only be accessed on foot. Take the trail from the Grotto Mountain day-use parking lot and walk about a kilometre to get to the narrow-walled creek bed, which twists and turns for another kilometre. As the smooth limestone walls get steeper and steeper, you'll come upon a fork in the creek bed. Heading right takes you to a glistening waterfall. If you look carefully, just before the falls on the left at eye level, you will see Hopi pictographs, painted some 500-1,000 years ago.
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