TweenTribune: When Will the Leaning Tower of Pisa Topple?

Have you ever wondered if the Leaning Tower of Pisa is a catastrophe waiting to happen? In this one-minute video, Ask Smithsonian host Eric Schulze explains how architects and engineers spent the last eight hundred years or so making things go from bad to worse, bringing the gravity-defying tower to the brink of disaster. (1:15)