Final answer:
The Pillars of Hercules were a pair of rock formations that marked the entrance to the Strait of Gibraltar, symbolizing the boundary between the Mediterranean Sea and the Atlantic Ocean.
Step-by-step explanation:
The Pillars of Hercules were a pair of rock formations that marked the entrance to the Strait of Gibraltar. They were considered by the ancient Greeks to be the westernmost point of the known world. The pillars symbolized the boundary between the Mediterranean Sea and the Atlantic Ocean, and they were an important landmark for ancient navigators and explorers.
The phrase 'Pillars of Hercules' is also used metaphorically to represent strength, stability, and the limits of the known world. The concept of the Pillars of Hercules is often referenced in literature, art, and popular culture as a symbol of exploration and the desire to push beyond established boundaries.
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