Location from Percy Jackson by Rick Riordan
The Titans' base in the Bay Area — Mount Othrys, the Titan seat of power, exists on this mountain overlooking San Francisco.
Mount Tamalpais is where the Titans established their base during the Second Titan War — the real mountain in Marin County serves as the foundation for Mount Othrys, the Titan palace that exists in the mythological layer above the peak. Atlas holds up the sky here, his muscles trembling under cosmic weight, surrounded by the golden ruins of the Titan stronghold. The Garden of the Hesperides glimmers nearby, guarded by the dragon Ladon. The final battle of the Titan's Curse quest took place here, with Percy, Thalia, and Annabeth fighting Atlas and his forces on the rain-slicked summit.
A real mountain in Marin County with a mythological overlay — the ruins of Mount Othrys, the Titan palace, sit on its peak in the mythological layer. Atlas holds up the sky here. The Garden of the Hesperides is nearby.
Also known as: Mount Tam, Mount Othrys, Mount Tamalpais