[juanmanuel]

I've seen in trade fairs where they showcased how some historic buildings have been 3d scanning their frieze sculptures (among other things), then been replicated in the original material (marble, travertine, granite, sandstone, etc) with a CAM machine. Then they moved the originals indoors and put the replicas in their place. As far as I could see, the last step was done by hand (the ultrafine detailing and the polishing of the stone).
It still is an impressive thing to watch, though.
The machines were a bit expensive, going around USD$150,000 and up.