A city with hundreds of leaning buildings, the world's scariest airport, and the world's biggest sewage pipe are home to engineering disasters in need of repair, and experts use cutting-edge technology to reveal if they can be fixed.

A giant sinkhole, a multi-million dollar road to nowhere, and a wind turbine off the coast of Denmark on the brink of disaster are engineering catastrophes in need of repair, and experts use cutting-edge technology to reveal if they can be fixed.