Experience the thrills – and major chills – of scaling a frozen waterfall

Nestled just outside Quebec City, the majestic Montmorency Falls reaches heights of some 275 feet – a full 100 feet taller than the Niagara Falls. During the long Canadian winters, cliffs beside the main waterfall freeze over entirely, giving the appearance of cascading water stuck in time. In this short documentary from 1978, two daring climbers (plus a daring film crew) scale the Pilier de Crystal – a massive sheet of ice sitting beside the main waterfall. The result is a thrilling – and extraordinarily chilling – portrait of human skill, athleticism and drive amid an arresting and imposing landscape.