
Casterly Rock
is an impregnable FORTRESS.
Game of Thrones Season 7, Episode 3

And the FORTRESS they built here
has never been overcome.
Game of Thrones Season 4, Episode 5

Welcome to my FORTRESS of shame.
The Big Bang Theory Season 9, Episode 19

Welcome to my FORTRESS of solitude.
The Big Bang Theory Season 8, Episode 7

I'd call it a
"Fortress of Solitude for babies."
The Big Bang Theory Season 10, Episode 6