The Citz.

Spent the evening at the theatre - saw Trainspotting at the Citizens Theatre. (The actor playing the lead role is a nephew of a friend of ours, and it was just superb).
Before Irvine Welsh's novel was made into the famous movie by director Danny Boyle, there was a theatre production of Trainspotting at the Citizens Theatre, and it's now been brought back to the stage for a sold out run.

First opened in 1878, the Citizens Theatre is quite an iconic venue in Glasgow:
www.citz.co.uk