This is the Ramshorn Church, built in 1720 and now owned by the University of Strathclyde. Situated right in the heart of the Merchant City, it's now a theatre that shows just about everything, from Greek drama to Scottish comedy.
Behind the theatre is a spooky graveyard, where you can have your lunch with ghosts. Meanwhile, in front of the building, these delightful images have been carved into the pavement.