"Derinkuyu, located in Turkey, is an impressive underground city that stands as the largest among more than 200 ancient subterranean cities. Spanning nearly 172 square miles, it is designed to house approximately 60,000 residents across its 18 levels. This remarkable achievement in engineering has its origins dating back 3,000 years."
Actually the dates of artifacts of coastal Aladsk natives (fish trap pegs, and lithographic remains, date back between 20-30,000. There is also new discoveries made with carbon dating man made objects from high mountain areas (which were closer to the water before geological processes). Novice kids who learned random information in proven historically inaccurate textbooks need to shut up or bother to learn the modern facts. Modern science beings all kinds of historical lies to forefront .
*Alaska