The Vatican

The Knights of the True Cross are Exorcists that have been locked in combat with the demons of Gehenna for centuries. Their main headquarters, the Vatican, is located in Italy, though it considers itself its own country and is one of the most Holiest sites in Assiah, AKA Earth. To train new Exorcists, the Knights of the True Cross have set up school in every place that holds Holy land. Mephisto Pheles, Tamer and Honorary Knight, has designed a way of traveling between all of these locations with the help of his Infinity Key, a key enchanted by Mephisto that allows one to open a door to any designated location. Mephisto has designed whole towns to provide for the Academies set within, as well.