https://twitter.com/WatchersOTWall/status/657636577129164800 It hasn't been confirmed what this structure is, but a drawbridge and blue screens to stretch out the castle walls make it look a lot like Riverrun. There's a lot of excitement around a battle in the North (more on that later) meaning that the scenes at Riverrun have gone under the radar. Thrones are going bigger than ever for Season 6.