Modern Marvels: Giant robots on the factory floor and in outer space. A floating fortress that's home to 6,000 military personnel, which is almost as long as the Empire State Building is tall. And a diesel engine with 108,000 horsepower. (You read that right.) These giants must be seen to be believed! In this episode, we travel over land and sea to find these and more of the biggest, baddest, most audacious feats of engineering in the world.