Ely Cathedral (www.elycathedral.org) is truly extraordinary. If you get the chance, take the tours up the Octagon and the West Tower to really get a sense of scale. The Octagon, built in the 1320's, is a masterpiece of medieval engineering. I took these photographs using the in-camera HDR function on the 5D Mk III on the recent Experience Seminars Interior Photography Practical Workshop. Not your average interior!