From the longer Italian Wikipedia page [1]
The State Archives of Turin collects all the documents of the members of the House of Savoy, to which over time have been added the archives of illustrious families and personalities, archives of associations, of industries and the administrative documentation produced by the Kingdom of Sardinia and by the Peripheral offices of the Italian State in the Province of Turin . This important heritage, kept on approximately 83 linear km of shelving, makes the Archive a rich mine of information that allows historians and others to explore 1300 years of history in Piedmont, Italy and Europe.
The Turin State Archives are of considerable importance not only for the documentation preserved, but also for the reasons that led to the construction of one of its current locations. The building hosting the Court Section of the Archive was in fact designed and built by Filippo Juvara between 1731 and 1733 to respond to the need for administrative centralization typical of an absolute monarchy such as the Savoy, and represents the only case currently known. in Europe of purpose built building from the beginning for archival use. Precisely as an architectural synthesis of this rigid policy, the seat of the Court Section was included by the Sabaude - also tangible evidence of the control exercised by the dynasty over the territory - and as such recognized as a World Heritage Site in 1997.