I trained in hardcore bodybuilding gyms from the age of 16 to about 36.
In Glasgow, Yorkshire, Birmingham and London.
Whilst it is all about the atmosphere and people, the best gym for me was Dorian's Temple gym back in 1996/97. The equipment really worked as it was supposed to, knowing it was DY's gym lifted me up more than a triple dose of the original Ultimate Orange, and you were encouraged to train like a Beast. Too much talking and Debbie would shout at you.
What's the best gym you've trained at?