How Did They Build That?

A sculptural new transportation hub for New York's World Trade Center is beset by challenges. Amsterdam gains a striking building inspired by a mountain valley. And a new launchpad for space travel prepares for liftoff in the New Mexico desert.

A gravity defying university building in Sydney Australia is clad in 320,000 bricks. Engineers grapple with making an angular arts center tornado proof in Oklahoma. And a plant-filled office building made out of three giant spheres takes shape in Seattle

Engineers grapple with an apartment building, ripped apart by a man-made canyon. The iconic Gateway Arch takes shape in St Louis, Missouri. And an unpromising plot in Copenhagen is transformed by a gleaming new triangular office building.

A dazzling new 1400 foot tapering skyscraper is built right next to New York's Grand Central. A curving wine museum requires ingenious engineering in Bordeaux, France. And possibly the world's most glamorous parking garage takes shape in Miami.

A 1.2 million square foot office building balances precariously on a 39 foot wide base in Chicago. A building named Pterodactyl lands on top of a Los Angeles parking garage. And the world's longest suspension footbridge is constructed in Czechia.