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What is the secret tunnel under Brooklyn?

The Cobble Hill Tunnel (also known as the Atlantic Avenue Tunnel) is an abandoned Long Island Rail Road (LIRR) tunnel beneath Atlantic Avenue in Brooklyn, New York City, running through the neighborhoods of Downtown Brooklyn and Cobble Hill.



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Many of the disused subway stations and tunnels running under NYC are closed to the public for safety reasons, but there are still ways to see them. In some cases, you can catch glimpses of disused subway tunnels or subway platforms while riding past on currently operating lines.

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The Beijing Underground City, also known as Dixia Cheng, is an impressive engineering feat that lies beneath the bustling streets of Beijing, China. This vast network of tunnels and chambers spans over 33 square miles at a depth range of approximately 8-18 meters.

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The Holland Tunnel is one of three vehicular crossings between Manhattan and New Jersey; the two others are the Lincoln Tunnel and George Washington Bridge. (Eastbound only) As of January 8, 2023: Cars $17.00 (Tolls-by-Mail)

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The Union Canal Tunnel, owned and operated by the Lebanon County Historical Society, is the oldest existing transportation tunnel in the United States. From 1827 to 1885 the Union Canal linked the commercial centers of Harrisburg, Reading, and by extension, the port of Philadelphia.

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Technically called “Tunnel Street,” the three-block-long passage is the city's only underground street, according to 6sqft. It serves as a Broadway entrance to the 191st Street subway station, which, at 175 feet underground, is the deepest in the system.

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Dingess Tunnel has been called “America's Bloodiest Tunnel” due to stories from the late 1800s/early 1900s of immigrant and African-American coal miners and railroad employees being murdered while traveling through the tunnel (Appalachian Magazine, 2014.)

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The Twin Bores 15, 1968, and was completed five years later on Mar. 8, 1973. The Eisenhower Tunnel celebrates a big milestone of Connecting Colorado for 50 Years as of March 8, 2023. This bore was originally called the Straight Creek Tunnel, and later was officially named the Eisenhower Memorial Bore.

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