This is artwork of the Iron Throne. George R.R. Martin himself has said that it comes closer than any other artistic image of capturing what the Iron Throne is supposed to look like in the book continuity.
This artwork is copyrighted by artist Mark Simonetti. He has given his permission for the artwork to be re-used for educational/wiki purposes.
See also: http://marcsimonetti.deviantart.com/
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The Iron Throne is the throne upon which the King of the Andals and the First Men sits, located...