Nolli's famous map of Rome is considered one of the masterpieces of urban cartography. Fundamental to the study of Roman cartography, it remained a model for all maps of Rome until the 20th century and was the first to distinguish between magnetic and astronomical north and to differentiate with graphic clarity between archaeological remains and contemporary buildings. Nolli's New Map of Rome consists of 12 iconographic tables and four index tables. The work was commissioned to Giovan Battista Nolli in the 1740s by Abbot Diego de Revillas, around whom an association of scholars, mathematicians and antiquarians gravitated in Rome. With this undertaking, Rome equipped itself with an updated and rationally conceived plan through modern instruments for scientific surveying. The Nolli Plan, in fact, had to respond to the specific need to constitute, on the basis of an urban planning thought of Enlightenment origin, a fundamental document for the management of the territory of the City, suitable for the systems of modern European capitals. The engraving was carried out by Giuseppe Vasi, Rocco Pozzi, Pietro Campana and Carlo Nolli, based on a design by Giovan Battista Nolli, Giovanni Paolo Pannini and Stefano Pozzi.