Mount Etna

Mount Etna (located in Sicily) is where celestial bronze is forged. It's peak was sheered off by Zeus' Master bolt. It was also where Typhon was imprisoned before the westward migration.In it is one of Hephaestus 's forges. In The Battle of The Labyrinth some of Kronos 's monsters invade it (current mount St. Helens) and Hephastesus asks Percy to stop them. Percy then goes to Mount Etna with Annabeth and trys to summon water from too far away, which almost kills him. He is then blasted out of the mountain and lands on Calypso's Island. The eruption stirs the monster Typhon in his sleep and ends up waking him up.