A skyscraper sinking into the earth, the world's strongest wall in crisis, and a deadly bridge are engineering catastrophes in need of repair, and experts use cutting-edge technology to reveal what went wrong and if they can be fixed.

A skyscraper causing hellish heat in downtown Dallas, a swarm of sinkholes, and a landmark with a fatal secret are engineering catastrophes in need of repair, and experts use cutting-edge technology to reveal what went wrong and if they can be fixed.