From The Week, 30 Nov 2007 (I know, I know):
An underground "cultural guerrilla" group has been marauding round Paris and ruthlessly restoring the city’s landmarks. A court heard last week how members of the "Untergunther" movement broke into the Pantheon in September 2005 and set up a secret workshop behind its famous dome. Under the supervision of a professional clockmaker, they then set about repairing the antique clock that city officials had allowed to rust since the Sixties.
Here’s the story at the Guardian, which from the date (26 November) is the source for The Week (no online version) extract above.