The world's most beautiful bookshop, the Boekhandel Selexyz Dominicanen in Maastricht, according to The Guardian. Read all about it here. It's essentially a giant modular bookshop frame erected inside a Dominican church. If they had erected the self-same framework inside an aircraft hangar, and stocked it with the same books, it doubtless wouldn't have won. The prize is going to the church, then, even though as part of the permission to use the building, it was stipulated that the shop would not impinge on the church building in any way.
Brussels also got a mention, in the form of the art bookshop Posada. Choosing a shop that sells art as well as art-books might seem like cheating. But not as bad as voting a church Best Bookshop.