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Derinkuyu, often referred to as the largest underground city in the world, was discovered in 1963 when a man unearthed a vast network of tunnels while digging at his home in Turkey. This extraordinary city in Cappadocia extends over 3,100,000 square feet and was designed to accommodate roughly 20,000 individuals and their livestock during tumultuous times. Its expansive structure comprises 18 levels, featuring essential amenities such as ventilation systems and running water—an architectural marvel from an era designed for survival.