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.
AppearanceThe pillars are two large white columns, that are as big as the masts on the Argo II. They are carved in a Grecian style.
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.
- 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.
|Magical Locations:||Aeolia | Camp Half-Blood (Grove of Dodona) | Camp Jupiter | Cave of Trophonius | C.C.'s Spa and Resort | Daedalus' Workshop | Lotus Hotel and Casino | Mount Othrys | Ogygia | Olympus | Pan's Cave | Sea of Monsters | The Labyrinth | Tartarus | Underworld | Waystation|
|Cities, States, and Towns:||Alaska | Bar Harbor | Bologna | Chicago | Detroit | Gila Claw | Indianapolis | Jamestown | Long Island | New Mexico | New York City (Manhattan) | Quebec | San Francisco | Dalmatia (Split) | Vancouver | Venice | Westport|
|Other Locations:||Apennine Mountains | Aunty Em's Gnome Emporium | Carlsbad Caverns | Crusty's Water Bed Palace | Empire State Building | Gateway Arch | Grand Canyon | Greece | Hoover Dam | Italy | Junkyard of the Gods | Mount Diablo | Mount Etna | Mount Saint Helens | Mount Tamalpais | Pikes Peak | Polyphemus' Island | ROFL | Rome | Triple G Ranch | U.S.A. | Waterland|