Château de Grouchy

Owned by the Val-d'Oise département and the town of Osny, the Grouchy estate covers forty-one hectares in the Viosne valley. It alternates woodland, a lake and vast lawns, and its ecological management protects the wetlands to encourage the return of plant species, notably orchids.

Registered as a historic monument, the château is named after the last private owners, the Marquis Jean de Grouchy, great-grandson of Marshal Emmanuel de Grouchy (1768-1847). Since 1989 it has housed Osny town hall. On the third floor, an exhibition of oils and watercolours by the painter William Thornley can be seen.

History lovers will find all the typical features of a 19th-century landscape park: French formal gardens, a dovecote, terraces, a statue of a child, a temple of love, the old kitchen garden, an ice house, the lake, a statue of Diana the huntress and the main gate. A discovery trail presents the park's ecological riches and historical traces.

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