Smallpox

To send people to Mars, NASA must create the most powerful rocket ever built. Here's the story of the Orion Space Craft, an engineering feat designed to sustain astronauts for years in one of the universe’s harshest environments.

How did engineers build the tallest bridge on the planet? As tall as a skyscraper, the Millau Viaduct braves deadly wind speeds over an immense abyss, and we go inside the story behind this modern wonder.

The AT&T Stadium in Texas is home to the Dallas Cowboys and the world's largest retractable roof. This $1.2 billion stadium can house over 100,000 fans, and we'll go inside how this engineering feat was built.

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

How did engineers move mountains to build the longest and deepest rail tunnel on the planet? Discover how 25 million tons of rock were moved to build this modern wonder.

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

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.

London's 73-story glass skyscraper is an engineering marvel. 11,000 exterior glass panels form this mega tower's façade. A colossal concrete core supports luxury apartments, a hotel, and nearly 600,000 square feet of office space.

Discover what it took to build the largest and most sophisticated radio telescope on the planet. This engineering colossus will help astronomers explore galaxies and planets billions of light years away, and might help discover extraterrestrial life.

Go inside the ambitious engineering project to remake the Panama Canal. Billions of dollars were spent to move millions of cubic tons of earth, and ultimately, the canal will be able to accommodate the biggest ships in the world.

Learn what it took to build the largest ship in the world, the Pioneering Spirit. This 900,000-ton behemoth can install oil pipelines in the world's deepest waters and features state-of-the art thrusters and mammoth lifting beams.

Enter a state-of-the-art research base located in Antarctica, the coldest continent on Earth. Halley VI is built atop giant skis on a floating ice shelf, and this innovative design helps scientists brave the extreme environment.

Uncover what it took to build one of the most ambitious rail projects in history, London's Crossrail. This staggering feat will span over 73 miles and transport 200 million people a year around one of the world's busiest cities.

Discover what it took to build the world's tallest freestanding tower, the Tokyo Skytree. This record-breaking marvel faces some of the most deadly disasters on the planet, and must brave earthquakes and extremely high winds.

The International Space Station is the most expensive engineering project ever attempted, and a masterpiece of modern ingenuity. This vessel pushes the boundaries of space exploration and brings us closer to galactic colonization.

The US Navy is the largest sea force on the planet and their new Littoral Combat Ships are the fastest combat ships in its fleet. Built for speed, these innovative warships can travel at over 40 knots per hour in shallow water.