The Cave of Hercules is one of the most Moroccan popular tourist attractions. It has two openings, one to sea, known as "The Map of Africa", and one to land. There are also markings everywhere on the walls.
The enter cost isn't expensive (About "5 MAD/0.44 EUR/0.53 US Dollar").
The cave is located 14 Km west of Tangier city, near the summer palace of the King of Morocco (Mohamed VI).
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By: @hrw7