Salisbury Cathedral
Not an accidentally upside-down shot, this is a reflection in  William Pye's modern font, installed in 2008. It is the largest working font in any British cathedral, is cruciform in shape, and has a 10-foot-wide vessel filled to its brim with water, so that the water overflows from each corner into bronze gratings embedded in the stone floor. The stillness of the water turns it into a mirror, reflecting the architectural splendour above, as this lovely shot of the nave demonstrates.
salisbury cathedral font williampye reflection nave