10 Underwater Cities You’ve Never Heard Of


Crete, an island along the coast of Greece, is rather ancient. Due to erosion from the ocean, parts of the island have sunken into the waters. One such city-state that was lost was Olous. Nearly 40,000 inhabitants once lived within the area.

Llys Helig

There is a legend told of a Welsh prince who constructed a huge palace along the north of Wales. The stories claim this palace was as large as a city and was known as Llys Helig. Surveys of the area revealed a wall buried under the ocean where the city would have one stood.