900 years

In Glasgow for the day to see the Scottish Youth Theatre's two summer shows (excellent, both of them) and insisted to younger son that we go for a walk in between. Went up to the Necropolis to prove to him there are vistas to be found in Glasgow, and spotted this intriguing quartet of roofs.

From fore- to background:

St Nicholas Garden renovation 1995
Provand's Lordship 1471
St Mungo Museum of Religion in Life and Art 1989
Glasgow Cathedral 1136