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Extreme Engineering unveils some of the most ambitious architectural plans of our times. Some are theoretical; others are in the works. But all must face challenges that stretch the definition of what's possible. Take a look at the projects from Season 1.

Tokyo's Sky City
It would house 35,000 residents and host 100,000 daily workers, students and visitors. This space-age city in the sky might seem like science fiction, but it answers some questions about where humans might live as our most crowded cities become even more densely populated.
Take the interactive tour. 		  sky city
Transatlantic Tunnel
So, if you could take the train from New York and in less than an hour reach London, would you do it? What if you had to make the journey through a tunnel 150 feet under the Atlantic? And on a magnetically levitated train traveling at 5,000 mph?
Take the interactive tour. 		  transatlantic tunnel
City in a Pyramid
Imagine a self-sustaining pyramid-shaped city in the air. And imagine that it is built by robots and with little help from human workers.
Take the interactive tour. 		  pyramid
Bridging the Bering Strait
For the first time since the ice age, there could be a bridge across the Bering Strait linking Asia and North America. First, engineers must learn to deal with 55 miles of violent seas and crushing ice over the Arctic Ocean.
Take the interactive tour. 		  bridge
Tunneling Under the Alps
How might Europe be different if the great land barrier of the Alps could easily be traversed via tunnels?
Take the interactive tour. 		  alps tunnel
Building Hong Kong's Airport
In the 1990s, Hong Kong undertook one of the largest civil engineering projects in history when it decided to build a new international airport 16 miles out to sea. See how it was done.
Take the interactive tour. 		  airport
Holland's Barriers to the Sea
Most of Holland is below sea level, the nation a drainage basin for three major rivers. Its people have fought back against floods since the Middle Ages. But now, they have massive, computer-controlled sea barriers and dams doing the trick.
Take the interactive tour. 		  holland dike
Boston's Big Dig
How do you put a new, 10-lane highway 120 feet below downtown Boston without succumbing to crumbling earth, and without endangering the buildings and people above? It's happening right now.
Take the interactive tour. 		  big dig
Widening the Panama Canal
For nearly a century, one of the world's most important waterways has let ships make a commercially critical shortcut between the Atlantic and Pacific oceans. But many of today's ships are too big for the man-made canal. Can it be widened?
Take the interactive tour. 		  panama canal
Subways in America
How do you overhaul one of the nation's oldest and most traveled subway systems without shutting down a city for several years? New Yorkers are finding out.
Take the interactive tour. 		  subway

Pictures: DCI |

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