In the modern age, the history of the European city was heavily influenced by the construction of fortifications. Nowadays European military, state and municipal archives are the custodians of the many drawings that are evidence of the ways in which the necessities of war shaped the city. This has become an important archival heritage that today ought to be rediscovered, promoted and re-evaluated. For years, city plans were often kept secret because they were strategic documents for state security. Over the centuries, when the urgencies of war were halted, they were dispersed among various archives. Until the beginning of the 18th century, a number of cities were under Spanish rule (they are now present-day Piedmont). The plans for these ci...