Anyone ever done the Crypt Lake hike?

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Voted "Canada's best hike" in 1981, this lake is in Waterton Lakes National Park, Canada, but the international border is just behind the lake, and the wall behind it (in the shade above) is in Glacier National Park, in Montana. The hike involves traversing narrow ledges with sheer 1000-foot drops and crawling through a tunnel, not to mention a long hike up a valley at the beginning and back at the end.



Article on Crypt Lake hike: http://www.besthike.com/northamerica/canada_rockies/crypt.html

One of many videos: http://www.youtube.com/watch?v=EjdaqLr8vVg