The 42 buildings of the UNESCO World Heritage Site "Genoa: the new streets and the system of the Palazzi dei Rolli (Palaces of the Lists)" are located along the Strade Nuove, the “New Streets”: Via Garibaldi, once known as "Strada Nuova", via Balbi, via Cairoli, originally called "Strada Nuovissima, via Lomellini and via San Luca.
The buildings for public use are home to museums and public bodies, and they are open to the public all year round, while those for private use are partially open to visitors.
The numbers next to the Palazzi dei Rolli indicate the order of inscription of the building to the UNESCO World Heritage List.
The “bussoli” represented a luxury rating system in which all the stately homes were divided and listed. The criteria were: the size and wealth of the palace, the visitor's rank, and the social and economic importance of the building's owner.