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Home to the British colony of Gibraltar, the Rock of Gibraltar is a limestone promontory at the tip of Spain that guards the northeastern end of the Strait of Gibraltar, linking the Mediterranean Sea with the Atlantic Ocean. It contains many caves and defense works and is home to a colony of macaques—the only wild primates in Europe. Known also by its Latin name, Calpe, the Rock of Gibraltar is considered one of the Pillars of Hercules described in ancient mythology. What is the other “pillar”?