The Chapel, Gonville and Caius College, Cambridge.
I have a sentimental attachment to this place, because I got married here nearly 24 years ago. At that time, it was beautifully lit with candles. But I have to admit that, most of the rest of the time, the dark oak and limited light makes it rather gloomy. It takes some careful photography to do it justice by natural light.
Click image for a larger version.