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

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

    The underground city was planned to be three times the size of Denmark, at 52,000 square miles, and include more than 2,000 firing positions for the Iceman missiles. But the plan was never ...

  3. Underground city - Wikipedia

    en.wikipedia.org/wiki/Underground_city

    Crystal City in Arlington County, Virginia, an 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 ...

  4. List of tunnels in the United States - Wikipedia

    en.wikipedia.org/wiki/List_of_tunnels_in_the...

    Completed in 1909, this road tunnel runs beneath the former Birmingham Terminal Station site, now occupied by the Red Mountain Expressway. [1] John H. Bankhead Tunnel, a 3,389-foot-long (1,033 m) road tunnel, US 98 under the Mobile River in Mobile. [2] Blount Tunnel, a rail tunnel near Blount Springs. [3]

  5. SubTropolis - Wikipedia

    en.wikipedia.org/wiki/SubTropolis

    The interior of SubTropolis. SubTropolis is a business complex located inside of a 55,000,000-square-foot (5,100,000 m 2), 1,100-acre (4.5 km 2) mine in the bluffs north of the Missouri River in Kansas City, Missouri, United States.

  6. Underground Tours That You Didn't Know Were Right Under ... - AOL

    www.aol.com/underground-tours-didnt-know-were...

    While the town rebuilt, business owners moved underground, creating a city beneath the streets. Visitors can tour spaces once used as saloons, markets, and even a bordello. Adults pay $17; tours ...

  7. The Story Behind the Largest Walmart in America - AOL

    www.aol.com/story-behind-largest-walmart-america...

    Today, Walmart operates more than 10,500 stores around the globe, with a total of 1.7 million employees. Though its success as a company seems ubiquitous, the U.S. retailer hasn’t prospered ...

  8. Category:Secret places in the United States - Wikipedia

    en.wikipedia.org/wiki/Category:Secret_places_in...

    Underground Railroad locations‎ (3 C, 54 P) Pages in category "Secret places in the United States" The following 19 pages are in this category, out of 19 total.

  9. Dallas Pedestrian Network - Wikipedia

    en.wikipedia.org/wiki/Dallas_Pedestrian_Network

    The Dallas Pedestrian Network or Dallas Pedway is a system of grade-separated walkways covering thirty-six city blocks of Downtown Dallas, Texas, United States. [1] The system connects buildings, garages and parks through tunnels and above-ground skybridges.