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

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

    The city of Sacramento is yet another community lifted above floodwaters during the latter half of the 19th century, leaving behind underground spaces. Adults can tour the historical remnants with ...

  3. Bobby Hopper Tunnel - Wikipedia

    en.wikipedia.org/wiki/Bobby_Hopper_Tunnel

    Approved in 1987 and completed in 1999, at a cost of $458 million, the alternate route, I-540, eventually renamed I-49, [2] had an obstacle of an unnamed 1,800-foot-tall (550 m) peak just north of the Washington—Crawford county line, in what John Haman of Arkansas Business called "smack in the middle of motoring wilderness."

  4. 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 ...

  5. 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]

  6. 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 ...

  7. 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.

  8. Inside Walmart’s company seat in Bentonville, a once-sleepy ...

    www.aol.com/finance/inside-walmart-company-seat...

    Even the Walmart Museum, housed in some of the company’s original store locations, is getting a facelift, with a new interactive, life-sized hologram of founder Sam Walton, who died in 1992.

  9. List of ghost towns in Arkansas - Wikipedia

    en.wikipedia.org/.../List_of_ghost_towns_in_Arkansas

    Arkansas Post: Arkansas: 1686: 1863: Barren site, protected area: Armada: Crawford: Austin: Old Austin Lonoke: The original site has since been abandoned. [3] Barbara: Washington: Bartholomew: Drew [3] Bear City: Garland: 1882 Mostly woods and a few houses, some active. Small population, but has regained interest in recent years with new ...