I read the article about the Great Altar of Zeus found at http://www.fivedoves.com/letters/aug2011/stevene82.htm with interest.
(Note: The author, Steven, repeatedly spells "altar" as "alter." Perhaps, you could correct this error.)
I believe he only scratched the surface of WHY Satan's throne is in Pergamos. IMHO, it is much greater than what he has written. I concur with Walid Shoebat's assessment that Pergamos (modern day Turkey) will be the origin of the Antichrist. Jesus wrote here that "Satan's throne" is in Pergamos. Did it go away...? Did it move...? Did Satan decide to change his mind...? The answers to these questions is NO -- otherwise Jesus would have said so somewhere else in Scripture -- but He didn't.