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underground
underground
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Name
Since
‘Catacombs’ of Petrovaradin Fortress
Serbia
2019
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A 6th-Century Cistern Hidden Below a Carpet Store
Turkey
2018
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A Bookstore in an Old Gold Mine Shaft
United States
2018
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A Huge Abandoned Fortress Hidden Inside a Mountain
Spain
2018
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A London Pub With Underground Prison Cells and a Spy Room
United Kingdom
2017
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A Medieval Network of Canals Is Hidden Under Salzburg
Austria
2017
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A Medieval Shrine Hidden Beneath a Parking Lot
United Kingdom
2018
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A Portal Into the Buried Canal That Runs Through Washington D.C.
United States
2017
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A Vintage New York City Subway Map, Hidden in Plain Sight
United States
2017
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Abandoned Bunkers of Salpalinja
Finland
2020
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Agongointo-Zoungoudo Archaeological Park
Benin
2020
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Alderly Edge Mines
United Kingdom
2021
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Aldwych Tube Station
United Kingdom
2020
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Ali Barbour’s Cave Restaurant
Kenya
2019
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An Abandoned Canal Route Hides Beneath Manchester, England
United Kingdom
2019
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An Ancient Underground Mithraeum in Israel
Israel
2018
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An Archaeological Museum Inside a Madrid Subway Station
Spain
2018
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Avshalom Cave
Israel
2019
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Basilica of San Crisogono
Italy
2019
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Beer Quarry Caves
United Kingdom
2018
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