Flakturm IV, Feldstraße
The Feldstraße flak tower, Hamburg St. Pauli, in 2024, five extra storeys added atop the wartime structure. Photo: Skgbl, Wikimedia
Kilian U-boat Bunker
The Kilian bunker ruin at Kiel-Dietrichsdorf, photographed in 1979, two decades before its final demolition. Photo: Ulrich Kessler, Wikimedia Commons,
Elbe II U-boat Bunker
The Elbe II bunker ruin at Vulkanhafen, Hamburg, photographed in 1981. Photo: Dietmar Rabich, Wikimedia Commons, CC BY-SA 4.0. Steinwerder,
Flakturm Humboldthain
The surviving section of the Humboldthain flak tower, Berlin. Photo: Lukas Beck, Wikimedia Commons, CC BY-SA 4.0. Gesundbrunnen, Berlin, Germany
Fink II U-boat Bunker
The surviving ruins of the Fink II U-boat bunker, Hamburg-Finkenwerder. Photo: flamenc, Wikimedia Commons, CC BY-SA 3.0. Hamburg-Finkenwerder, Germany ·
Bunker Valentin
Forced labourers at work on the Valentin construction site, 1944. Photo: Bundesarchiv, Bild 185-09-25, Wikimedia Commons, CC BY-SA 3.0 DE.
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, Italy ·
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, East New
Iwo Jima and Mount Suribachi
The second flag-raising atop Mount Suribachi, 23 February 1945. Photo: Joe Rosenthal, Associated Press — public domain (US copyright not
The Last Command Post, Saipan
The ruins of the Last Command Post, the final Japanese headquarters on Saipan. Photo: Yp8080123, Wikimedia Commons, CC BY-SA 3.0.