Lilleshall Abbey, Shropshire

English Heritage
An Augustinian abbey, dissolved by Henry VIII. It was later adapted as a Civil War stronghold. Substantial ruins of the Abbey church and other buildings remain, in a deeply rural setting. As one enters the nave, an inconspicuous spiral stairway on the left leads up to a viewpoint high up on the wall. There are some elaborately carved doorways.
It’s worth a visit if you are passing near Telford.