5 Secret Underground Cities and Their Fascinating Historie

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Derinkuyu, Turkey: – An ancient underground city with eight levels, once a refuge.

Wieliczka Salt Mine, Poland: – Expansive salt mine turned underground marvel with stunning chapels.

Burlington Bunker, England: – A hidden city beneath a quarry, designed for government continuity.

Dixia Cheng, China: – Massive subterranean city constructed as a bomb shelter.

Cheyenne Mountain Complex, USA: – A military fortress nestled inside a mountain for strategic defense.

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