The Doors (n.f)

If you're an outsider, you may be allowed to be one of them; if you're already in then there's no way out. It was and never will be always delightful to be in there but from outside that place has the kind of impression that made strangers wonder what's inside in that 'house', it was almost a nirvana level pleasure resource for insiders.
Long story short, welcome to The Doors.