Italy has given birth to countless navigatores and chart-makers, and Genoa, in particular, was the cradle of medieval cartography, attested since the early fourteenth century by the celebrated Genoese cartographic school.
We would therefore take that tradition as a starting point to speak - without any claim to completeness - of historical maps, conservation centers, unpublished collections, specialistic works.
A mention is due to the Istituto Idrografico della Marina, namely the Italian State mapping agency responsible for producing official navigational charts, which the law requires mariners to have on board for the protection of navigation and human life at sea.
Everything about old maps and charts on the web and in libraries, with over 3500 extensively annotated links [in English] to the Internet and to basic texts, in the site of Tony Campbell http://www.maphistory.info/index.html
Cartography - with the reproduction of the Peutinger map - geography and exploration in the classical era in the site [in French] http://terra.antiqua.free.fr/index.html
A specialistic user-friendly site is www.worldviewmaps.com