Have you ever heard of Atlantis? The ancient city that was devoured by the waves and cast into the bottom of the sea? Although Atlantis is a fictional tale, it turns out that there are several real life sunken cities, many of which you can visit today (with an air tank that is). Watch the video below to learn about Egyptian Alexandria, Greek Pavlopetri, and Jamaican Port Royal. Discover how cities sink beneath the waves and what modern cities are at risk today.