Episode 22

Turning Torso aims to be the tallest building in Northern Europe.

In Japan, plans are on the table to build Sky City, the tallest structure on earth. The towering, vertical city will house more than 100,000 people. Sky City would be home to the world's very first homesteaders in the sky.

To prevent flooding in Venice, Italy, a large barrier must be constructed.

New York City struggles to balance attracting more people with the ability to transport them efficiently. After decades of neglect, the city's subway nears collapse, and a public works project promises a complete overhaul of this once-great system.

A new wave of massive container ships are changing the shipping industry.

Engineers face the challenge of carving a 45-mile tunnel in Iceland.

Tokyo is one of the most crowded cities in the world. To relieve the stress on a city bursting at the seams, engineers look to build a massive Pyramid over the water, with skyscrapers suspended like peapods within its enormous frame.

The longest, cable-stayed bridge in the US is constructed.

The Hong Kong international airport is the largest civil engineering project in history and the largest enclosed space in the world. It is also 16 miles out to sea and built on a platform that was constructed by leveling two small islands.

Daily, ships the size of a city block transport goods through the Panama Canal to make the 50-mile shortcut between the Atlantic and Pacific Oceans. Officials have asked a team of European and American engineers to compete for a winning lock design.

Engineers are erecting the tallest bridge in the world, the Millau Viaduct.

Engineers have developed the fastest, most advanced excavator ever built.

To most of the world the Alps are a scenic wonder. To merchants and truckers, they're roadblocks and bottlenecks. The 35-mile-long AlpTransit Tunnel is one way to keep Europe moving. Unfortunately, Alpine tunnels stay dangerous forever.

The Delta Works, a series of massive, computer-controlled sea barriers and dams, straddle each of the major rivers emptying into the delta. The Measlandkering is a gigantic sea surge barrier. These are two of the engineering wonders of the world.

Construction crews are tasked with building a state-of-the-art oil rig.

In a series of engineering firsts, two interstate highways are being rebuilt beneath Boston, sending its traffic 120 feet underground! The "Big Dig" will take more than 30 years to build, but not without confronting unprecedented challenges.