Casterly Rock
is an impregnable FORTRESS.
Game of Thrones Season 7, Episode 3
The greatest FORTRESS ever built.
Game of Thrones Season 2, Episode 7
I'd call it a
"Fortress of Solitude for babies."
The Big Bang Theory Season 10, Episode 6
and abandon this FORTRESS
you can no longer hold.
Game of Thrones Season 4, Episode 8
And the FORTRESS they built here
has never been overcome.
Game of Thrones Season 4, Episode 5