Sears Tower Skydeck is on top of the world

The Sears Tower Skydeck opens its lure for thrill-seekers Thursday. It's called the Ledge and it gives the illusion of standing on air a few feet outside the building, 103 stories off the ground.

It could put the Skydeck on the must-see list for tourists, right up there with the museums and Michigan Avenue shopping. It's supposed to be an engineering marvel.

The tower's bosses speak assuringly of the Ledge withstanding every test the public can think of. Patrons will survey the city from four bays made up of three layers of half-inch thick glass, according to a July 1 Chicago Sun-Times report.

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