The chief gardener of Paris, horticulturist Jean-Pierre Barillet-Deschamps, then went to work, planting thousands of trees, shrubs and flowers, along with creating sloping lawns. At the same time, the city's chief architect, Gabriel Davioud, designed the miniature Roman temple on the top of the promontory, modeled after that at Tivoli near Rome, as well as belvederes, restaurants modeled after Swiss chalets, and gatehouses like rustic cottages, completing the imaginary landscape. The park opened on 1 April 1867, coinciding with the opening of the Paris Universal Exposition, and becoming an instant popular success with the Parisians.