I grew up in Thetford, on the Abbey estate, the majority of houses needed re-pointing and general work due to crap build and materials, but bits of the Cluney monastry that it’s named for that was destroyed by Henry’s purge can be seen built into walls all over the older parts of town. The wall at the back of Colchester bus stop is Roman, still standing, still nearly scalable, shame me and me and my mate had to find the weak bits half-way down on an acid mushed up moment, “leap, weee, ouch”