Humans have been building for more than ten thousand 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. We analyse what went wrong with each building blunder.

In San Francisco, California, residents in a luxury apartment block noticed their floor wasn't flat. Experts and witnesses analyse what happened to the building.

Once considered the eighth Wonder of the World, the Kinzua Bridge was the longest railway bridge in the world. But, a freak tornado destroyed it – why did it fall?

What epic engineering error caused flooding in Chicago? Plus, on the east coast of the UK, residents seek a solution for their houses that are falling onto the beach.

What architectural error ruined a Paris landmark? Plus, in Dallas, Texas, soaring temperatures and sunrays blaze and reflect into high-rise apartment building.

Over a hundred thousand people evacuate their homes, as America's tallest dam struggles to hold back storm waters.