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Great Siege Tunnels, Upper Rock, Gibraltar, UK
Photo Gallery Date: Dec, 2014 Location: Upper Rock, Gibraltar, UK The Great Siege Tunnels were dug out by hand, mainly using sledgehammers and crowbars, aided by gunpowder blasts, from the solid limestone by the British during the Great Siege of Gibraltar at the end of the 18th century. The Great Siege was an attempt…