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