Quantico

All scenes shot in the locker rooms, gym, workout rooms, medical clinic, and combat gym were filmed at the Quebec national sport institute located inside Montreal's Olympic stadium.

An FBI academy is really situated in Quantico.

"Quantico" was once the original title for another FBI procedural called 'Criminal Minds' which is also produced by Mark Gordon. It was thought that Quantico wasn't a catchy enough title to entice audiences.