12 Mysterious Underground Tours

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Berlin has an array of secret bunkers, escape tunnels—even an underground aircraft factory—built by the Nazi regime during WWII and expanded during the Cold War.
Courtesy Berliner Unterwelten e.V./D.Arnold
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Cramped corridors dug below Edinburgh's South Bridge became a crowded slum and eventually a rumored dumping ground for murder victims.
Courtesy Mercat Tours
The Basilica Cistern in Istanbul is a cavernous space outfitted with imposing domed ceilings and towering Corinthian columns, two of which are mounted on giant Medusa head bases.
Ancient tunnels beneath the heart of Jerusalem's Old City expose layers of the Western Wall. Visitors can see the remnants of the 3,000-year-old temple built by King Herod and walk along a road that ran next to the temple in Herod's time.
Courtesy State of Israel Ministry of Tourism
Under the streets of Naples lie a Greco-Roman theater, homes, and ancient aqueducts now lined with WWII-era graffiti.
Courtesy Napoli Sotteranea
Napoli Sotterranea lead tours of a network of nearly 250 miles of narrow caves and tunnels constructed two millennia ago beneath Naples.
Courtesy Napoli Sotteranea
No longer in use and almost forgotten, the original City Hall subway station in downtown Manhattan has intricate brass chandeliers, leaded skylights, and arched Guastavino ceiling tiles.
Courtesy New York Transit Museum
Originally built in the 1300s, Paris's underground sewer system was greatly expanded by influential civic planner Baron Georges-Eugène Haussmann in the 1850s.
Courtesy wools/Flickr
A menacing graffito on the walls of a Paris sewer.
Courtesy wools/Flickr
Transient laborers were allegedly kidnapped and sold into slavery in the late 19th and early 20th century in the Shanghai Tunnels beneath Portland, Ore.'s Chinatown.
Courtesy Portland Walking Tours
From ancient Christian burial grounds to underground dungeons, enough secrets are trapped below Rome to form the basis of another Angels and Demons.
Courtesy Avventure Bellissime
After the Great Fire of 1889 destroyed 25 city blocks, Seattle rebuilt one story higher because of flood concerns, pushing the charred remains below ground level.
Courtesy Bill Speidel Enterprises
Visitors can walk along the sidewalks, streets, and storefronts, some still intact and some restored, of underground Seattle.
Courtesy Bill Speidel Enterprises
The 3rd Infiltration Tunnel below the Korean border was dug in secret by North Korea, apparently designed for a surprise attack on the South. It's just 32 miles outside Seoul.
Vienna has a maze of medieval cellars, preserved baroque crypts, excavated Roman ruins, and underground passageways for exploring.
Courtesy Vienna Walks & Talks

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