There is an 1829 meridian line on the floor and wall of the Cathedral [Peter Ransom; Sundial corner no. 8: Meridian lines; BSHM Newsletter 30 (Autumn 1995) 38-40].
See THIS LINK
A plaque to Percy Heawood (1861-1955) in Durham Castle records his efforts in getting the Castle restored. Heawood was Vice-Chancellor of the University and Mayor of Durham, but is remembered by mathematicians for pointing out a flaw in Kempe's attempted proof of the four-colour theorem.
There is a portrait in the Hall of the Castle of Temple Chevallier (1793-1873), who was professor of mathematics from 1835 and also of astronomy from 1841 until 1871.
To see an Ordnance Survey map click at THIS LINK
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An extract from The Mathematical Gazetteer of the British Isles created by David Singmaster
The original site is at THIS LINK