Piacenti SpA created a special intervention for conservation while restoring all exterior areas in stone by careful weeding, biocide chemical treatments, removal of old grouting, surface consolidation of sandstone, dismantling and reassembling unstable parts, repointing, followed by a final cleaning and the application of protective treatment. A system of ties has been installed to stabilize the building in the event of earth tremors. The bronze bell supports have been restored and replaced, with the bell in it’s original position at the top of the Fort. The entire operation was carried out behind the scenes by means of scaffolding and corridors made of panels and appropriate temporary structures to enable the Leonardo Museum to remain open to the public.