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Photo of old underground metallic bunker
An abandoned pillbox bunker in the forest on Mount Dajti near Tirana in Central Albania. A relic from the 1960s -1980s Hoxha government's bunkerization program driven by a fear of invasion
The stone the Zulu king Shaka was said to have been sitting on when he was assassinated by his half-brothers in August or September 1828
Ouvrage Schoenenbourg, a Maginot line , Alsace, France
dome-shaped concrete circular fortress is slightly above ground. a trench is dug around it for entry from the back. gun emplacements and an observation post on hill. providing protection , fort douaumont
Kochbunker in the forest near Blachownia, an industrial part of the city of Kędzierzyn-Koźle. This bunker is an extremely popular light combat and observation bunker built by Nazi Germany both on the eastern and western border of the Third Reich during the Second World War.
A River casemate Oeffelt south, northern bunker to defend the Maas bridge at Gennep, North Brabant part of the Maas line ran from Maashees to Katwijk
Old Japanese bunker from second world war at a beach outside the city of Sabang which in the main city on the island Weh north of Sumatra
With a farm and silos in the distance,  a large Middle Mississippian mound stands in the Azatlan State Park.  The Native American mound dating from 900 A.D was abandoned around 1200 A.D.
Antiaircraft tower of Luftwaffe in Vienna is large ground-based concrete blockhouses armed with air defense, used by Luftwaffe during Second World War from air bombardments by anti-Hitler coalition.
Fort Battice is a fortress built in 1934 and part of the forts around Liege in the Belgian province of Liege.
Surrey countryside WW2 inland defence line near Guildford Surrey England Europe
Bunker in Stachelberg line, Czech Republic
Ruins of an ancient mill inf the swamp of Audomarois in the north of France
– May 28, 2022: Kristiansand, Norway - May 28, 2022: Fort Odderoya, built 1667-1914, played a major role in battle of Kristiansand on 9 April 1940.
Section of Fort Knox, Prospect, Maine, USA
Observation post at Fort Douaumont near Verdun. Battlefield of First World War One
Beautiful blooming white wildflowers in green rural field during spring season
The medieval walls of Lucca, Tuscany, Italy
A recreational alley in the former moat of the Nysa Fortress, which is a tourist attraction and the backyard of the City Park.
the observation bunker on the \
Private entrance to the historic Hohensalzburg fortress in Austria.
Houten, the Netherlands 12 November 2023. Dutch concrete bunkers built in the Dutch pasture. Part of the Nieuwe Hollandse Waterlinie
Normandy, France, September 02, 2019: Looking at a 150mm canon of the Longues-sur-Mer artillery battery wich was constructed during the World War II by germans army near the french village of Longues-sur-Mer. The battery was sited on a 60 m (200 ft) cliff overlooking the north sea and formed a part of Germany's Atlantic Wall coastal fortifications. But it couldn´t prevent the Allied landing beaches of Gold and Omaha and shelled both beaches on D-Day (6 June 1944).
Brest, Belarus - April 30, 2023: Pillboxes of a complex of fortifications from the Second World War
Circular arrangements of megalithic stones in  Alentejo Portugal
Plokštinė missile base, Lithuania
Vyborg, Leningrad Oblast, Russia - June 06, 2023: Part of fortress in Vyborg of 11 centuries. Vyborg Castle exterior on a sunny day in summer. Old stone wall with windows, clear blue sky
Russia, the Republic of Crimea, the city of Sevastopol. 06/10/2018: Defensive tower of the Kornilov bastion on Malakhov Hill
Saint George's, Grenada: Fort St. George is a historical fortification that played a crucial role in the island's colonial past. Built by the French in the early 18th century and later expanded by the British, the fort sits atop a promontory overlooking the harbor of St. George's, providing strategic defense for the capital city. Its position offered excellent vantage points to monitor sea approaches and protect the valuable port. The fort's architecture typically includes thick stone walls, cannon emplacements, and military buildings reflective of 18th-century colonial fortifications. Over the years, Fort St. George has witnessed numerous historical events, including battles between European powers vying for control of the Caribbean.
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