Mars Castle

Mars casttle (マルスの居城 - marusu no kyōjō,) This castle is located a few hundred meters from the Babel Tower, and that is where the family resides Mars and his army on Earth. Aria is also held captive.

The Saints, private headquarters after the destruction of the Sanctuary, meet there also to receive their orders.
 * Aria is trapped on the 70th floor of a tower west.
 * Eden, in his youth, visits Aria, already imprisoned in a tower. However, it seems impossible that the castle has been on Earth at that time (it would have been to the Sanctuary).