Why humanity builds its most enduring cities beneath the surface
In short: While we often define urban life by skyscrapers, some of the world's most significant cities exist entirely underground. This documentary explores the diverse reasons why humans have sought refuge and sanctuary deep below the earth's surface.
Humanity has constructed underground habitats for centuries to survive extreme environments, including blistering heat, treacherous cold, and the devastation of war. These subterranean spaces serve as vital refuges from natural disasters and surface-level space constraints.
A significant driver for underground construction is concealment. In the United States and other nations, hidden cities were specifically designed to shield government and military installations from enemies. Despite their intended secrecy, many of these subterranean marvels have become famous landmarks.
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- Summary by Intellect · source: The world's Most incredible Underground Cities| Documentary
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