Art in the Chapels.
An annual event in the Blavet valley in Brittany. Art installations are on view at each Chapel.
I've found mention of 26 Chapels participating. There are photos here of 5 which I visited in one day. (gallery in progress)
26 in one day would be a lot of miles and not much time to appreciate the Art so a long weekend will be necessary.

http://www.artchapelles.com/internet/index.php?numrubrique=532

http://blog.holidayfrancedirect.co.uk/2013/06/modern-art-in-historic-settings-art-in-the-chapels-2013/