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‘Catacombs’ of Petrovaradin Fortress
Serbia
2019
100,000 Soldiers of Trabuc Caves
France
2018
1930 Folk Street
China, People's Republic of
2019
816 Underground Nuclear Plant
China, People's Republic of
2019
A Hidden Park in Pittsburgh
United States
2018
A Labyrinth of Caves Stretches Beneath Bristol
United Kingdom
2018
A Medieval Network of Canals Is Hidden Under Salzburg
Austria
2017
A Secret ‘Tunnel of Love’
Romania
2018
A Secret Tunnel of Bones in One of Malta’s Oldest Churches
Malta
2017
A Secret Tunnel Underneath Taipei’s Grand Hotel
China, Republic of (Taiwan)
2021
Abandoned Eriksdal Train Tunnel
Sweden
2019
Abandoned Mineral Belt Railroad Tunnel
United States
2019
Abandoned Salt Tunnels on the Spanish Coast
Spain
2017
Acequia Madre
Mexico
2019
Aeroseum
Sweden
2019
Al Yanfa
2022
Albarracín-Cella Roman Aqueduct
Spain
2019
Alcoy and Maigmó Greenways
Spain
2018
Alderly Edge Mines
United Kingdom
2021
Alpine Tunnel
United States
2021
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