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, the Gotthard Base Tunnel.

For NASA to send a person to Mars, they will need to build the most powerful rocket ever built. Discover inside story behind the Orion Space Craft, an engineering feat designed to sustain astronauts for years in one of the universe's harshest environments.

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.

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 and 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.

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

The Shard, a 73-story glass skyscraper in London, has 11,000 exterior glass panels, a colossal concrete core that supports luxury apartments, a hotel, and close to 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.