How Did They Build That? (2021)

S04E10 Floating Parks & Upcycled Towers

The San Francisco Museum of Modern Art has expanded, tripling its original size in a bold architectural move. Meanwhile, an old skyscraper is being taken down piece by piece through a clever process of smart demolition. And in Dallas, five acres of new parkland now hover above bustling traffic, creating a surprising green oasis in the sky.