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I was here as well! This is the throne room of the Red Keep, with massive decorated columns and a gallery to one side. It’s hard to tell, but the wall of the gallery features a relief of a hunting scene, a nod towards all the tapestries featuring scenes of hunts that Robert is supposed to have used after he removed the dragon skulls. The throne room is, I think, smaller than I tend to envision it… and it’s not easy to see how nineteen dragon skulls could have hung on the walls. It’s possible that CGI will be used to make the room seem to have a very high ceiling to help convey the regal power embodied in the room.
To the right, and behind the camera, would be the dais on which the Iron Throne is found.