Castle Black is nice enough.
Game of Thrones Season 3, Episode 6
Let me try to persuade the Blackfish
to give up the CASTLE.
Game of Thrones Season 6, Episode 8
but you'll be able to come visit me
at Castle Black when you're better.
Game of Thrones Season 1, Episode 2
It's not a CASTLE.
Game of Thrones Season 7, Episode 4
Castle Black.
Game of Thrones Season 3, Episode 5