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Episode 1
The Houston Dome Project is a radical attempt to provide a solution to the city's damage from hurricanes, heat and the growing problem of global warming.
Episode 2
Connecting Russia and Alaska this would be the most ambitious and expensive tunnelling project ever attempted. CGI shows how the project could take shape.
Episode 3
Personal Pods are a high-speed, non-stop, self-driving transit system that could solve traffic problems in Washington DC. How would they work?
Episode 4
Chicago is home to some of America's most iconic skyscrapers, but with real estate at a premium, could an underground city be the solution to the space crunch?
Episode 5
Shanghai faces a double crisis: overpopulation and urban sprawl. Could the solution be building up and constructing the planet's tallest tower, over 1.5km high?
Episode 6
Some engineers believe the way for New Orleans to escape the water is to build a floating city. Long a dream for engineers, science has finally caught up with the...