The Citadel is an archive of information for George R.R. Martin's A Song of Ice and Fire.
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One thing that I GRRM mentioned that I had not read before was that he filmed a cameo for the pilot in Morocco. It had been subsequently cut because everything was refilmed in Malta. Sorry if that is old news and I missed it.
The Westeros network consists of several different sites, including a forum and a wiki, for all your A Song of Ice and Fire needs.