Catastrophe strikes a major interstate in Connecticut. In Montreal an Olympic stadium turns into an epic disaster, and a huge levee fail floods a town in the Netherlands.

In 2015, workers began to renovate the Queen Juliana Bridge in the Netherlands. But the decision to use two cranes would have devastating consequences.

In Montreal, a vital highway crossing collapses, with tragic consequences. And, an engineering catastrophe hits a legendary space mission more than 300,000km from earth.

A revolutionary floating bridge in Washington sinks into the bottom of a lake. And, an engineering disaster in the Gulf of Mexico causes a global crisis.

In Boston, MA, a deadly flaw brings traffic to a screeching halt. A river crossing collapses in Wales, and a dam collapse in Spain changes the course of history for one town.

A Chicago skyscraper hides a deadly flaw. A fuel storage depot goes up in a fiery inferno, and a championship stadium suffers a devastating collapse.

A bridge in Washington State plummets into a river. In the north of England, a television tower collapses. And, a building full of priceless relicts is completely destroyed.

An epic crane catastrophe wrecks a Milwaukee ballpark. A bridge in Washington State sinks like a ship, and a stadium roof collapses in Connecticut.

In 1973, the Aon Center became the tallest marble-clad building in the world. Years later, Chicago's extreme weather would turn its beautiful exterior into a death-trap.

In Germany, an alpine ice rink roof collapses in seconds. In Tennessee, a toxic wave washes through a community. In Nebraska, a dam loses to nature.

In Pennsylvania, a vital bridge collapses to the ground. In Australia, tragedy strikes a packed commuter train heading into Sydney.

In Arizona, a fire destroys a vital river crossing.

What caused a Baltimore street to collapse onto a railroad? How did engineers fix London’s wobbly Millennium Footbridge? Experts and witnesses analyse what happened.

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?

In Maryland, an aging and crumbling sewage system wreaks havoc in Baltimore. Experts and witnesses analyse what caused the major environmental and health problem.

In Sweden, a historic bridge is destroyed in seconds.

In New Jersey, an inferno rages at the heart of a community. In New Zealand, a volcanic flood takes down a crucial rail bridge.

A skyscraper in London risks killing pedestrians when large and heavy bolts from the support structure begin falling to the road below. And, why did a highway in Germany collapse?

In Texas a refinery explodes with deadly consequences.

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.

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

Why did an apartment block in Liverpool resist demolition? And, how did an engineering mix-up in Bristol derail a new bus route? Experts examine what happened.