Platon described the great capital of Atlantis, which was a strong fortified town with seven high walls. In antiquity this city was known world-wide, but in the time of Plato the city was sunk again in the sea. Only the legends about it were preserved. The place were the city once lay was forgotten, nearly everywere.
Only in the area were the city once was laying and were, of course, one must find remains of it, the memory of the city was never forgotten. Until the 15th century and even to this day one speaks of this city at the coast of the Baltic Sea, the biggest town of Europe as old German historians reported in the 11th and 12th centuries.