Westeros
The 'A Song of Ice and Fire' Domain
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Game of Thrones S3: In Production 18
Thoros of Myr pushes Arya along into a cavern, with other men of the brotherhood without banners about him. Interesting.
This would be the “hollow hill”, an important hiding place for the brotherhood, and the location of an important scene.
HBO
Thoros of Myr, S3, In Production, Game of Thrones, Behind the Scenes, Arya Stark