A landslide in Baltimore takes out part of a residential street, the Leaning Tower of Pisa is almost toppled by an engineering solution, a New York City tower is in danger of collapse and a pedestrian bridge in London sways alarmingly.

A new San Francisco luxury tower that is sinking at an alarming rate and also tilting, the iconic city of Venice is threatened by rising sea levels and tidal surges, an ambitious glass floored pedestrian bridge design in Spain is not surprisingly slippery when wet and a German town is threatened by a sinkhole.

In Pennsylvania what was once tallest railroad bridge in world collapses, in France an 800 year old cathedral has challenges generations of builders and engineers, a canal near Chicago threatens the Great Lakes with an invasive species that could cause an ecological disaster, a German town experiences an earthquake in slow motion - due to a green energy initiative.

A number of downtown Chicago buildings are suddenly flooded due to the replacement of piles and old tunnels. In England extreme coastal erosion threatens a number of wooden houses without foundations build on the coastal cliffs. A Pennsylvania mining town has to be completely evacuated because the coal seam that was previously ignited by irresponsible practices has reached the town.

Reflections off a Dallas residential high-rise cause damaging glare for some of its neighbours and a sculpture garden, houses suddenly begin to sink in a area of Amsterdam, the marble cladding on a relatively new Paris landmark is alarmingly deteriorating and a row of houses that have stood for over a century in the UK Cathedral City of Ripon are threatened by a sinkhole.

The spillway of a major dam in California rapidly deteriorates threatening 180,000 residents, a plan to relocate the Stuttgart Railway Station underground goes off the rails due to local geology, a Scottish suspension bridge overcomes a problem with its cables but it cannot cope with the ever increasing traffic, and a fire in a multi-story car park in Liverpool is quickly out of control.

Baltimore has a major issue with aging infrastructure and a poor original design resulting in raw sewage in its waterways, a commuter train narrowly escapes tragedy on a rail bridge near Dublin, an eccentric Count in post-war Italy buys up land to build a hillside resort for the rich and famous that quickly encounters problems and eventually abandonment due to his reckless approach for the development, and an Irish housing estate is abandoned when the roads and services continue to sink though the houses themselves which were built on piles that remain stable.

A London tower known as the Cheese Grater is dropping bolts from its external frame that are the size of a human arm, in Germany parts of a relatively new stretch of autobahn are collapsing due to the soil and a new experimental building technique, the wet climate of Portland Oregon plays havoc with its streets and the maintenance process can't keep up, a Greek village is abandoned due to a landslide, local geology and the suspension of a water diversion program.

Skylab Space Station is falling back to Earth earlier than anticipated, a historic Italian town is abandoned due to geology and a infrastructure project, and a London skyscraper nicknamed the Walkie-talkie is creating havoc for pedestrians

A sturdy post-war Liverpool apartment block stubbornly resists multiple demolition attempts, a former Oklahoma mining town is both contaminated with multiple dangerous toxins and also highly unstable due to its history, wind turbines may be a source of green energy but engineers need to refine their designs, materials and maintenance protocols to extract the maximum energy possible, and Bristol's guided bus lanes require some adjustments due to installation errors.