Chateau de Tournay, Heritage château in Pregny-Chambésy, Switzerland

Château de Tournay stands on a slight rise above Pregny, on the right bank of Lake Geneva. It consists of two towers joined by a rectangular two-storey dwelling, covering 521 m² with a height of 22 m. A deep dry moat survives from the original stronghold, and the remains of a former ring wall, once topped by round towers, are set within the surrounding garden.

The seigneurie of Tournay, held by the de Brosses family from 1573 to 1778, was raised to a county by the House of Savoy in the 18th century. In 1589 Savoyard troops occupied the castle; Genevan forces burned it in 1590, and the family rebuilt it as a manor without fortifications. In 1691 Claude de Brosses had H. Droz repair it, and in 1758 Voltaire leased it for life.

The name Tournay comes from the seigneurie held by the counts of Genevois, later raised to a county by the House of Savoy. In 1758 Voltaire rented the castle for life and staged plays there, angering Geneva's Consistory, which led him to move to Ferney. The deep dry moat and remnants of the ring wall are visible in the garden.

The castle is private property and has been since 2009, so visits are limited to what can be seen from public paths around the estate. The building stands on a slight rise above Pregny, on the right bank of Lake Geneva; the dry moat and the remains of the ring wall, now part of the surrounding garden, are visible from outside. The estate covers 335,156 m², while the plot attached to the castle itself is 31,911 m².

The dry moat around the castle predates the present building and belongs to the original medieval stronghold. The remains of the former ring wall, once topped by round towers, were incorporated into the garden that now surrounds the house. The property has been privately owned again since 2009.