I'd call it a
"Fortress of Solitude for babies."
The Big Bang Theory Season 10, Episode 6
...I will be enjoying a blissful evening
in my personal Fortress of Solitude.
The Big Bang Theory Season 2, Episode 21
is an impregnable FORTRESS.
Game of Thrones Season 7, Episode 3
Welcome to my FORTRESS of shame.
The Big Bang Theory Season 9, Episode 19
And we need
every FORTRESS we have
Game of Thrones Season 7, Episode 1