Atlantis



Atlantis is the location of Poseidon's underwater palace. It is an underwater city inhabited by merpeople.

The Last Olympian
Tyson found Percy Jackson drifting underwater and took him to the palace. There he saw lots of mermen in the courtyard. The palace was in the process of being destroyed by Oceanus and was the size of Mount Olympus. In the throne room he met his father Poseidon, his stepmother Amphitrite, his half brother Triton and Delphin. Poseidon is an old man and is watching a mosaic in which every real building that gets destroyed in the mosaic. He sees Oceanus approaching and says goodbye to Percy.