These bas-reliefs can be seen in the center of the Pillars of Hercules monument in Gibraltar. Flanked between the pillars, the reliefs depict "The Ancient World" on one side of the monument and "The Modern World" on the other side.
The Pillars of Hercules is the ancient name referring to the two promontories at the eastern entrance to the Strait of Gibraltar, a narrow opening 14 kilometres wide between the Mediterranean Sea and the Atlantic Ocean separating the continents of Africa and Europe. The northern pillar is the Rock of Gibraltar (called Mons Calpe in ancient times) at Gibraltar. The location of the southern pillar, Mons Abila, on the African site of the strait is not know for certain, but the two most likely candidates are Monte Hacho in Ceuta (the Spanish exclave on the Moroccan coast) and Jebel Musa in Morocco, eleven kilometres to the west.
In ancient times sailors believed that beyond the Strait of Gibraltar, beyond the Pillars of Hercules was the end of the world and they dared not sail past the Pillars of Hercules for fear of falling in the end of the world.
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