Whoa," said Nico as he climbed off the bus. "Is that a climbing wall?""Yeah," I (Percy) said."Why is there lava pouring down it?""Little extra challenge..." - Percy

If you look at it from any other side, it looks like a pile of enormous deer droppings, but Chiron wouldn't let us call the place the Poop Pile, especially after it had been named for Zeus, who doesn't have much of a sense of humor.