An curved arrow pointing right. Saudi Arabia's Jeddah Tower will be the world's tallest building. It will be 1 km (3,280 feet) tall. Produced by Jacqui Frank. Special thanks to Emmanuel Ocbazghi.

Well, not yet—but it’s on its way. The country is currently constructing the Jeddah Tower, an ambitious project designed to claim the title of the world’s tallest building. Once completed ...