The Church of the Holy Sepulchre

Northampton

Parts of this church date back from 1100. Built by Simon de St. Liz (really) on his safe return from the Crusades (about which the less said the better). It was originally only a circular nave and based on the design of a church in Jerusalem of the same name. Typically, it has been added to since, but the circular nave is still there. Pity it's only open to the public on Saturdays - would have been nice to see inside.