Myrmeke's Lair

The Ant Hill is a giant ant hill in the Camp Half-Blood Forest. It is the home of the Myrmekes (ants the size of German Shepherds).

Demigod Files
Percy and Beckendorf discover The Ant Hill during a game of Capture the Flag. Soon afterward Beckendorf gets captured by the Myrmekes. With the help of the Bronze dragon, Silena, Annabeth, and Percy save him. It is where Festus was hidden.

The Ant Hill is revealed to contain massive amounts of treasures as the Myrmekes are attracted to shiny objects, and hoard them. Beckendorf says that they have more gold than Fort Knox.