Palazzo Boncompagni
The dwelling of Ugo Boncompagni, then became Pope with the name of Gregory XIII, was supposed to be built on the design of Vignola between 1537 and 1545; in reality, in all probability it was designed by Mascarini. influenced by the Vignola not only for the installation of the building but also for the helical shape of the staircase.
Via del Monte 5 - Bologne