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ruined wooden staircase on an abandoned path in a mountain forest

Drobak, Norway – May 21, 2022: The Kopas battery is a disused cannon battery under Oscarsborg Fortress. It is located on the ridge Kopas in Drobak. Sunny spring day.

Foxhole of World War One on Sabotin mountain, Slovenia

Sexten, Italy - August 3, 2016: Via ferrata Innerkofler De Luca with tunnel entrance in Sexten Dolomites. The tunnel was build during the first World War and leads to the mountain Paternkofel.

Close-up of the rugged rock wall lining an underground tunnel

Ketrzyn, Gierloz, Poland - July 19, 2021: marshal Wilhelm Keitel's bunker at the Wolf's Lair (Wilczy Szaniec, Wolfsschanze) built by the Organisation Todt. Adolf Hitler's headquarters in poland.

Exterior of Daniil Sihastrul's cave home near Putna, Romania. Daniil Sihastrul ignited a hermit movement in northern Moldova, having many novices in the woods surrounding Voroneț, as well as at the hermitages and monasteries in its surroundings. He encouraged Stephen the Great to fight for the defense of Christendom and to build holy places.

Kuhmo, Finland - August 17, 2021: view of trench from the the Finnish Soviet Winter War

panoramic view of a massive Salt Mine Cave in Garmsar of Iran

An ancient cave in the mountain

Natural cave at Cala Luna, a famous tourist destination in Dorgali municipality. Province of Nuoro. Sardinia. Italy.

Abandoned Military Tarakaniv Fort basements (other names - Dubno Fort, New Dubna Fortress) - a defensive structure, an architectural monument of 19th century, Tarakaniv, Rivne region, Ukraine.

Close-up of an corner ancient red granite stone brick wall, blue clean sky, green grass

in the rocky mountain built-in housing for people who hid during the wars. ancient settlement.

Entrance of the Szelim cave in Tatabánya

ruins of old war fort in Liepaja, Latvia in snowy winter day with overcast clouds. Karosta

A tunnel, known as the Nysa Bridge, is a late imperial Roman bridge over the Cakircak stream in Nysa ancient city in Aydin province of Turkey. It was built as a two-level structure: the bottom vault spanned the brook. On top of it a row of arches connected the two hills that formed the urban area. The ground arch spanned the stream on a length of some 100 m (328 ft), giving the bridge the appearance of a tube or a tunnel, although it was constructed entirely above ground.

bunker ruin of the wolf's lair or in german Wolfsschanze the german headquarters near Kętrzyn in Poland

A wide panoramic view inside a natural dissolution cave formed in gypsum.

Old bunker from World War II found in the french alps

Sea cave formed by weathering of soft sandstone cliff by wave action. San Gregorio State Beach, California, USA. Within the Monterey Bay National Marine Sanctuary. Note that the cave formed along an angular unconformity - the rock strata on the right is at an angle to the strata on the left.

Old underground passage, dungeon, catacombs lined with stones and slabs with paths from speleologists (spelunking)

Grjótagjá cave entrance in North Iceland

Overgrown tunnel entrance to a ruined 2nd world war Japanese bunker on Gili Trawangan, Indonesia

Ruderi di Guerra lungo la Tagliata del Ponale di Riva del Garda

military defensive fortifications. fort number 10. Vladivostok Russia

석회암 동굴의 벽 VD702

ruins of old military fortifications

Various valleys and gullies of water at the bottom of Lake Cerkniška in Slovenia. The lake thus dries up and flows into underground rivers approximately every 50 years.

Free Images: "bestof:Pihlajasaari ravine shelters.JPG en Ravine in Itäinen Pihlajasaari island An anti-aircraft gun position built by Russian Empire during World War I is located"

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