I just got back from a trip down the coast in Europe, and saw some very nice organs, but the crowning one was at the abbey of St. Etienne in Caen. Anyway, here's the organ, and it is not the fanciest looking organ in the world, but it was playing when I went into the abbey church, and I thought...holy cow, it sounds like a....yes, it's a Cavaillé-Coll, and although I've heard some good recordings of some choice ones, the real thing is utterly unbelievable.
As a bonus, the abbey, which also has a bit of a gallery, was putting on a Robert Doisneau show!