One World Trade Center, the tallest building in the western hemisphere and a famous modern landmark, is engineered to be the safest and strongest skyscraper ever built. This episode follows the final year of exterior construction, culminating with the milestone of reaching the symbolic height of 1,776 feet. For head of construction Steve Plate, as well as scientists, engineers, ironworkers and curtain wall installers, this is a construction job suffused with the history of the site and a sense of duty to rebuild from the ashes of Ground Zero.

Shanghai Tower isn't just a skyscraper — it's a vertical city, a collection of businesses, services and hotels all in one place, fitting a population the size of Monaco into a footprint the size of a football field. Within its walls, residents can literally work, rest, play and relax in public parks, looking up through 12 stories of clear space. Not just one, however, but eight of them, stacked on top of each other, all the way to the 120th floor.