Impossible Engineering

China's Three Gorges Dam is the largest and heaviest concrete structure on earth, and it produces more power than any hydroelectric dam ever built. Discover how engineers reshaped a river to accomplish this incredible engineering feat.

The Swiss literally had to move mountains to build the Gotthard Base Tunnel. The longest and deepest rail tunnel on the planet travels 35-miles underneath the Alps, and is a true modern wonder.

For NASA to send a person Mars, they will need to build the most powerful rocket ever built. The inside story behind the Orion Space Craft, an engineering feat designed to sustain astronauts for years.

A look at how engineers built the tallest bridge on the planet. As tall as a skyscraper, the Millau Viaduct is a modern wonder that braves deadly wind speeds over an immense abyss.

This stadium in Texas is home to the Dallas Cowboys and the world’s largest retractable roof. This $1.2 billion stadium can seat over 100,000 fans, and we’ll go inside how this engineering feat was built.

Go inside the largest cruise ship on the planet, a massive vessel that’s 1,181 feet long and a staggering 227,000 tons.

A 73-story glass skyscraper in London is an engineering marvel. The facade is comprised of 11,000 exterior glass panels. Its colossal concrete core supports luxury apartments, a hotel and nearly 600,000 square feet of office space.

The Virginia Class is one of the most advanced nuclear-powered, fast attack submarines ever produced for the US Navy. These technological titans are almost 400 feet long, and weigh a staggering 7,800 tons.