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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?

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.

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.

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.

Tunneling Under the Alps- How might Europe be different if the great land barrier of the Alps could easily be traversed via tunnels?

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.

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.

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?

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.

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.