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Watch Building on Ground Zero online — it may be available on legal streaming platforms such as YouTube, Netflix, Prime Video, Hulu, Disney+, and others.

Following up its Emmy Award-winning documentary, "Why the Towers Fell," NOVA probes the conclusions of the government's engineering investigation into the World Trade Center's collapse on 9/11, with updated analysis of the devastating attack and how subsequent knowledge gained will shape skyscrapers of the future. Yet is it practical or even possible to construct invincible buildings? "" features candid interviews with leading construction and safety experts, investigators, architects, and engineers—including Leslie Robertson, lead structural engineer of the original World Trade Center and Shanghai's new World Financial Center, and Jake Pauls, occupants advocate and evacuation specialist. From the hallways of the newly erected World Trade Center 7 in New York, to China, where the world's tallest building is midway to completion, NOVA explores the complex challenges of building tall buildings in the wake of 9/11.