A New York City skyscraper that could topple at any moment, a city street in Baltimore, Maryland that suddenly collapses, and a modern-day crisis at Pisa's Leaning Tower are serious engineering emergencies, and experts use cutting-edge technology to reveal if they can be fixed.

A railroad bridge on the edge of disaster, a nightmare in a fairy-tale town, and a massive cathedral in calamity are engineering catastrophes in need of repair, and experts use cutting-edge technology to reveal if they can be fixed.