A deep mystery surrounds the destiny of the Carrara family, whose memory lives on thanks to the presence of a building that has been strongly "present" in the historical-administrative events of Terni. But nothing is known about the family. It is known that building on their Palazzo was begun in 1378 by Francesco Carrara, and also, that seeing the size of the building, it was a wealthy family, but no sign of priors or notable members of society with this surname are listed in official documents. The Palazzo is located close to the ancient Flaminia road which crossed the city, not far from important places of power, behind the Palazzo dei Priori (which stood where the city theatre is located) and near to the church of San Pietro. A temple whose apse is practically opposite Palazzo Carrara, but which was not the Carraras' church, these were the patrons of the old San Giuseppe church, which can be seen today (close to the town market) which they reached by walking along the corridor from the entrance to their building and crossing the garden and vegetable gardens.
Rather than just a single Palazzo, in the XVth century, before you stood a building which took the role and the appearance of a separate agglomeration seeing as close to the building where the Carrara family lived, quarters had been built to accommodate the people who worked for them. But how they made their fortune, where they came from and what happened to them remains unknown. The building, of which remains part of the painted plaster under the roof, underwent various remakes in the period that stretched from the 16th to the 18th centuries. Inside frescos by Troppa (Apollo and Dafne) and other arists of the epoch can be admired. This building also suffered severe wartime damage.
After the extinction of the Carrara family the Municipal of Terni took over the building which once hosted the Municipal and following that the public library, the city's archeological collection, and the town prison up to a few decades ago. After restoration, the building has now been destined as municipal offices.