Humans have been building for more than 10,000 years - we’re engineering experts and yet every year tales emerge of construction calamites from all over the world. From the extraordinary to the ridiculous, this series uncovers the epic fails and near misses engineers would rather not talk about. A skyscraper with a killer secret, a crumbling cathedral and a bridge with a balance problem all make the hitlist of barely believable building blunders … and let’s not forget the original engineering fail, the Leaning Tower of Pisa. Who knew over-enthusiastic engineers trying to right the tower nearly destroyed it just 30 years ago? With access to design teams, eye witnesses and a panel of experts, we analyse what went wrong with each building blunder, investigate why they went undiscovered and reveal how on earth engineers are trying to fix them.