The Historical Archive of the Municipality of Genoa, based in Palazzo Ducale, preserves the documents relating to the administration of the city between the 15th and mid-20th centuries and holds a collection of manuscripts dating to the 14th–19th centuries.
The archive houses the permanent exhibition titled Amole, libbre, cannelle, dedicated to the historical collection of weights and units of measurement which were used in the city before the final introduction of the metric system in 1805.