The Nave (the place where the congregation sits) of Winchester Cathedral is reportedly the largest in the U.K. This image was taken with a very wide lens! They remove all the chairs sometimes, for some reason.
Technical note: This is a 3 exp HDR with some filter work done on it in CS. It was taken through an old -0.5 adapter which gives an apparent 7mm lens. There is some spherical aberration and vignetting from the adaptor. I processed this more than I normally do.