From ancient metropolises to today’s sprawling megacities, witness the breathtaking rise, reign, and fall of the world’s largest urban giants — and glimpse the future of civilization.

Scientists reveal new details about the 5.3-million-year-old flood, which triggered earthquakes, generated tropical-storm ...

Thonis-Heracleion once thrived at the mouth of the Nile, a vibrant city pulsing with trade and ceremony long before ...