Was going to try to add Les Sept Saintes (see Burl, Megalithic Brittany) to the Christianized Sites list, but couldn't figure out how. Never posted a site.
Only information on line is a Google Book posting of the third edition of Cadogan Brittany. Excellent book for stones seekers.
Les Sept Saint(e)s church; village of Les Sept Saintes, near Plouaret, France.
Burl: "Without doubt one of the megalithic curiosities of Brittany." The south transept is built partly over an allee-couverte. A wooden gate closes off the end of the dolmen, and little statues of Brittany's patron Seven Saints can be seen inside. Existing church not ancient; 1702-1714. Possibly the site of an earlier church.
Cute as a bug and twice as strange.