A wealth of human history lies submerged in ancient cities at the bottoms of lakes, seas and oceans of the world. Some of these urban centers were sent into the water via earthquakes, tsunamis or other disasters thousands of years ago. Many rui have just recently been rediscovered, by accident or through emergent technological innovations. Some have even caused scientists to question the history of human civilization.
Alexandria, Egypt: Off the shores of Alexandria, the city of Alexander the Great, lie what are believed to be the ruins of the royal quarters of Cleopatra. It is believed that earthquakes over 1,500 years ago were responsible for casting this into the sea, along with artifacts, statues and other parts of Cleopatra’s palace. The city of Alexandria even plans to offer underwater tours of this wonder.