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

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

    With 32 miles of caves and underground passageways, this national natural landmark is one of the longest caves in America. Besides being a site for tours and exploration, the caves are also the ...

  3. Secret passage - Wikipedia

    en.wikipedia.org/wiki/Secret_passage

    Hidden passages and secret rooms have been built in castles and houses owned by heads of state, the wealthy, criminals, and abolitionists associated with the American Underground Railroad. They have helped besieged rulers escape attackers, including Pope Alexander VI in 1494, Pope Clement VII in 1527 and Marie Antoinette in 1789.

  4. Tunnels in popular culture - Wikipedia

    en.wikipedia.org/wiki/Tunnels_in_popular_culture

    Bracknell's Old Manor is a sturdy 17th century brick manor house having a priest hole and is said to have secret passages connecting to the exterior. [21] Droitwich Spa is said to have a passageway that leads from St Augustine's church, Dodderhill, to Friar Street in the town centre. A system of tunnels is said to run from there to St Augustine ...

  5. Hidden underground tunnel system built by Incas found ... - AOL

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    (Getty Images/iStockphoto) After centuries of speculation, archaeologists in Peru have confirmed the existence of an underground tunnel network, thought to have been built by the Incas .

  6. Hobby tunneling - Wikipedia

    en.wikipedia.org/wiki/Hobby_tunneling

    An extensive network of underground spaces was constructed at his Welbeck Abbey estate in the 19th century, with a total length of around 24 kilometres (15 mi). [11] It included hallways, a ballroom, a billiards room, a library and a 900 metres (3,000 ft) tunnel from the mansion to the riding house, wide enough for several people to walk in ...

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

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  8. Secrets of the London Underground - Wikipedia

    en.wikipedia.org/wiki/Secrets_of_the_London...

    Secrets of the London Underground is a British factual documentary series presented by railway historian Tim Dunn and London Transport Museum's Engagement Manager Siddy Holloway, co-developer of 'Hidden London', the museum's programme of tours that gives visitors access to disused and historical parts of the network. [3] [4]

  9. Shanghai tunnels - Wikipedia

    en.wikipedia.org/wiki/Shanghai_tunnels

    The newspapers of the 19th century document tunnels and secret passages underground. Organized crime was the center of many of these stories. [ 1 ] [ 2 ] However, many of the more colorful stories claimed for the underground are highly dubious. [ 3 ]