
Stannis Baratheon garrisons at Castle Black.
Game of Thrones Season 5, Episode 4

Theon holds the CASTLE with a skeleton crew.
Game of Thrones Season 2, Episode 6

And here we are in their CASTLE,
ready to defend it.
Game of Thrones Season 8, Episode 2

He said Sansa had a brother at Castle Black.
Game of Thrones Season 5, Episode 1

If Jon is alive,
then Castle Black's where he'll be.
Game of Thrones Season 3, Episode 10