Folie Saint James

The Folie St. James was a French landscape garden created between 1777 and 1780 in the Paris suburb of Neuilly-sur-Seine by Claude Baudard de Saint James, the treasurer of the French Navy under Louis XV of France. It was the work of landscape architect François-Joseph Bélanger, who had designed the garden of the Bagatelle for the Comte d'Artois. Saint James instructed Bélanger: "make what you want as long as it's expensive."The main attraction of the garden was a collection of forty-eight fabriques, or architectural constructions, placed on both sides of the avenue de Longchamp, and connected by two tunnels.

Source: Wikipedia