Trentino-Alto Adige
Opera 3, Sbarramento di Fortezza
The interior of Opera 3, Sbarramento di Fortezza. Photo: Llorenzi, Wikimedia Commons, CC BY-SA 3.0. Fortezza/Franzensfeste, South Tyrol,…
Typology
Underground
13 places
Papua New Guinea
Rabaul’s tunnels
Japanese landing barges sheltered inside one of Rabaul’s hand-dug tunnels. Photo: pm67nz, Wikimedia Commons, CC BY-SA 3.0. Rabaul,…
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Germany
REIMAHG Works, Walpersberg
Surviving remains of the REIMAHG works at the Walpersberg, near Kahla, Thuringia. Photo: Alexander Hoernigk, Wikimedia Commons, CC…
Micronesia
The Last Command Post, Saipan
The ruins of the Last Command Post, the final Japanese headquarters on Saipan. Photo: Yp8080123, Wikimedia Commons, CC…
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