Sutro Tower is a massive transmission antenna in the Bay Area.
The Trials of Apollo[]
The Tyrant's Tomb[]
Apollo, Meg McCaffrey, and Reyna Ramírez-Arellano head to and climb the antenna, as they are attacked by ravens, to find the soundless god, Harpocrates. The group finds him imprisoned by Commodus and Caligula in a storage container that is hooked up to the tower to black out communications between demigods. The three free him and the Oracle of Cumae.