2:16 p.m.: Good thing you brought your windbreaker. Despite the afternoon sun beating down from a cloudless sky, it’s gusty up here, 6,400 feet above sea level. You’ve just stepped into the void, on the outermost tip of the new glass-and-steel Glacier Skywalk, cantilevered more than 100 feet off the side of Wilcox Mountain. Ahead loom the snowcapped peaks of the Canadian Rockies; below, you can spot bighorn sheep picking their way between verdant patches of alpine moss. Later, you’ll don a pair of crampons and hike the nearby Athabasca Glacier, which helped carve out the waterfall-studded canyons of Sunwapta Valley more than 3 million years ago. The forces of nature have never felt more present than they do here. Except gravity. Because right now, it feels like you’re walking on air.