This is the famous greek colloseum where tournaments are held with many different prizes and challenges. The tournament sometimes are held with keyblade wielders to go onto a new rank and to become stronger but even there are bad guys with keyblades who can become stronger from this tournament. There is also some kind of trail here that leads underground into the Underworld where all the dead souls of people stay at as also there is a three headed dog named Cerberus guarding the gate down there. Many monsters come into the colloseum like titans and other beasts. So this is the place of battle and even to train for things to come.