9. Pavlopetri: World’s Oldest Underwater City
In 2009, marine archaeologists led by the University of Cambridge mapped the submerged ruins of Pavlopetri off the coast of southern Greece. Buried beneath just three to four meters of water, the site revealed well-preserved stone foundations, streets, and tombs dating back some 5,000 years. The discovery, featured in National Geographic, highlighted one of the earliest examples of planned urban design. Researchers used sonar mapping and diving surveys to outline a grid layout of dwellings, courtyards, and harbor facilities, reshaping our understanding of Bronze Age coastal communities.
