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The Pillars of Hercules are the gateway into the Mediterranean Sea or the Mare Nostrum, that are guarded by Hercules. They are thought to be the Rock of Gibraltar and Jebel Musa in Morocco.

The Heroes of Olympus

The Mark of Athena

Leo Valdez steers the Argo II into the entrance of the Mediterranean Sea. However they cannot go any further as an island shimmers into existence. Hercules is seen standing on the beach of the island.

After Jason Grace and Piper McLean return from the island, Leo steers the trireme over the island and pillars into the Mediterranean Sea.

Appearance

The pillars are two large white columns, that are as big as the masts on the Argo II. They are carved in a Grecian style.
250px-Heracles

Heracles, guardian of the pillars

The pillars had a warning engraved on them, but to Piper it looks like the words are inlaid in the sand, in Latin, non plus ultra which means 'nothing further beyond' as for the Greeks and Romans, it was the end of their world.

Trivia

  • The Pillars of Hercules are the two parallel lines of the dollar sign ($), also known as cifrão. The Pillars of Hercules featured on the Spanish coat of arms, which were then used on Spanish dollars, from which the American dollar was derived from.
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