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  2. Underground city - Wikipedia

    en.wikipedia.org/wiki/Underground_city

    An underground city is a series of linked subterranean spaces that may provide a defensive refuge; a place for living, working or shopping; a transit system; mausolea; wine or storage cellars; cisterns or drainage channels; or several of these. Underground cities may be currently active modern creations or they may be historic including ancient ...

  3. 5 times entire towns were found buried - AOL

    www.aol.com/news/5-times-entire-towns-were...

    The city's inhabitants, possibly fearing persecution, fled underground and created an entire world. As many as 60,000 people may have lived in the city. Mervan Yavuz shows figures carved inside ...

  4. Derinkuyu underground city - Wikipedia

    en.wikipedia.org/wiki/Derinkuyu_underground_city

    The city at Derinkuyu was fully formed in the Byzantine era, when it was heavily used as protection from Arab Muslims during the Arab–Byzantine wars (780–1180 AD). [8] [9] [d] The city was connected with another underground city, Kaymakli, through 8–9 km (5.0–5.6 mi) of tunnels. [10]

  5. Closed city - Wikipedia

    en.wikipedia.org/wiki/Closed_city

    "Secret Cities" (article), from www.globalsecurity.org.* Right to the city in former Soviet Union closed cities (ZATO). Andrius Ropolas's paper focusing upon the social aspects of closed cites. Helpful bibliography. Maps. Secret / Closed cities in Google Earth Community at the Wayback Machine (archived 2008-12-04) (in Russian) Closed cities map

  6. Secret underground passageways discovered in ruins of 4,300 ...

    www.aol.com/secret-underground-passageways...

    Photos show the inside of the well-preserved hidden tunnels.

  7. NASA Finds Secret Underground “City” Hidden From ... - AOL

    www.aol.com/lifestyle/nasa-finds-secret...

    NASA scientists have unearthed an astonishing man-made spectacle, lying frozen 100 feet below an icy surface.“We didn’t know what it was at first,” admitted Alex Gardner, a cryospheric ...

  8. Cities of the Underworld - Wikipedia

    en.wikipedia.org/wiki/Cities_of_the_Underworld

    Cities of the Underworld is an American documentary television series that premiered on March 2, 2007, on the History Channel. The program explores the subterranean environment and culture beneath various civilizations.

  9. Metro-2 - Wikipedia

    en.wikipedia.org/wiki/Metro-2

    An underground service platform that is supposedly part of Metro-2. In 1991, the United States Department of Defense published a report entitled Military forces in transition, which devoted several pages to a secret government underground in Moscow. It also included a diagram of the system superimposed on a map of the city.