With its 876 hectares stretching over the ridges separating the Polcevera Valley from the Bisagno, on the hills behind Genoa, the Parco Urbano delle Mura is the largest expanse of parkland in the city, with views sweeping from the Promontory of Portofino all the way to the Cape of Noli, and from the Sanctuary of the Madonna della Guardia to Monte Antola and the Forts of the Bisagno Valley.
The 17th-century walls, forming a V shape that opens out to the sea, once surrounded the city. The Diamante, Fratello Maggiore, Fratello Minore, Puin, Sperone, Begato, Castellaccio, Tenaglia, and Crocetta Forts - built between the 18th and 19th centuries - formed one of the largest fortification systems in Europe.
Genoa's Eastern fortifications rise up on the left of the Bisagno. The Parco Urbano dei Forti, strung along a horseshoe-shaped ridge that begins and ends in the city after passing through wild, uninhabited heights, offers opportunities for hikes and day trips with a focus on history and nature.
The Quezzi, Ratti, Richelieu and Santa Tecla Forts, first designed in the middle of the 18th century, were completed during the first decades of the 19th century. They look down over splendid hillsides often largely covered with woodland. In a central, elevated position, at 560 m above sea level, Forte Ratti, which runs for a length of 220 m, represents the "Keep" of the fortification system.