The Parks of Nervi are an important historical/nature complex formed from the combination of several gardens that once belonged to private villas: Villa Gropallo, Villa Saluzzo Serra, and Villa Grimaldi Fassio. Today, these villas belong to the City of Genoa and have been transformed into museums.
http://www.visitgenoa.it/en/parchi-di-nervi-gropallo-serra-grimaldi-and-luxoro-villas