A plaque walled on a building on via Mazzini recalls that this building in Pietrasanta was the birthplace on October 12, 1821, of physicist Eugenio Barsanti who, with Felice Matteucci, invented the first prototype of the internal combustion engine (an engine that uses the internal combustion of gases to produce motive power). The habitation of the Piarist father with its elegant marble portal, is only visible from outside.