Odeon Kingswest, Brighton, England (picture from around 1973).
The theatre is still there but sadly the two largest screens have been divided.
It's now got eight smallish screens instead of one impressively large one, one rather large one and one reasonably large one.
The frequently malfunctioning escalator and steps are also gone.
As a seven year old I could barely see over the edge of the surrounding wall (especially with the crowd) all I could see was the church tower next door which looked like a gothic space rocket.
I watched all the individual releases here on holiday visiting relatives.
Salmon-like I returned here to watch the OT triple bill showing with my cousin, I took my niece to see the SEs there and I watched every PT episode there too.