my bet is porters to Alexander, which is spoken about repeatedly by NPCs (although unnamed or named by an near east type name) as a castle of Light across the Volcano in fact if i remember right you can even see it from somewhere in Mount.
This looks Alexandered.
I can tell from some of the towers and having seen quite a few Alexanders in my time.
http://i53.photobucket.com/albums/g6...s/img_0017.png
However, these tower clusters appear scattered throughout the Silver Sea, which leads me to believe that either Alexander is e-fucking-normous (spanning the entire Silver Sea floor) and the towers are just tips of a collosal, mechanized iceberg
or these are several "mini-Alexanders" that are not contiguous parts.
Whatever the case, I think SE knew that "Alzadaal" wouldn't fool any FF fan for very long.