Sydney is home to a fifth Australia's entire population and is trapped between the Blue Mountains and the ocean, sitting on the driest inhabited continent on Earth, and surrounding one the planet's largest natural harbours. This episode uncovers what is inside Sydney's buildings and beneath its streets that allow the city to function - from the concealed contours of the harbour that allow super-sized ships to sail into the heart of the city, to the underground caverns that store its water.

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Ancient City: Rome

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Paris was built on top of ancient limestone quarries and the city's modernization has taken its toll; the streets are collapsing. Using CGI to strip it, layer by layer, we explore the infrastructure that keeps it from crumbling under its own weight.

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Using CGI animation to strip it of its steel and concrete, layer by layer, we explore the infrastructure that keeps Chicago standing amidst extreme winters and fierce summer heat waves that have ravaged the city for decades.

Machu Picchu, the crown jewel of the sprawling Incan empire, is constant threatened by earthquakes, landslides, and torrential rain. Using CGI to strip it, layer by layer, we explore the infrastructure that keeps it from tumbling down the Andes mountans.

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NYC is situated at the corner of coastline that acts like a funnel channeling deadly storms. Using CGI animation to strip it of its steel and concrete, layer by layer, we explore the infrastructure that keeps it standing through these massive storms.

Tokyo, home to over 35 million people, is rocked by 1500 tremors a year, and has a volcano looming over it that is overdue to erupt. Using CGI to strip it of its layers, we explore the infrastructure that keeps Tokyo ready.

The entertainment capital of the world has been rocked by some of America's most devastating earthquakes. Despite that, downtown LA is packed with skyscrapers. Using CGI to strip it, layer by layer, we explore the infrastructure that keeps them standing.

enice is sinking while sea levels are rising, a recipe for disaster. Using CGI animation to strip it of its steel and concrete, layer by layer, we explore the infrastructure that keeps Venice afloat through frequent floods and erosive salt water.

Sitting on a hurricane highway, and surrounded on every side by water, New Orleans is directly exposed. Using CGI to strip it of its steel and concrete, we explore the infrastructure that keeps New Orleans safe from 30ft waves and tropical cyclones.