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Sometimes called the Pillar of Hercules, the Rock of Gibraltar is a massive limestone promontory overlooking the Gibraltar Straits. The inside of the Rock is criss-crossed by a complex system of underground fortifications, known as the Great Siege Tunnels. This network of tunnels was begun by the British in 1782 during the Great Siege of Gibraltar by the Spanish. By 1942 there were over 30,000 British soldiers, sailors, and airmen stationed on the Rock.
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