Alfred Victor duPont (son of Alfred I. duPont) and Gabriel Massena, oversaw the construction of the Sunken Gardens, which were built between 1928 and 1932. The walls and steps are Italian travertine; the statuary is Carrara marble.
The main statuary group at the top and the side statues in the fountains are by French sculptor Charles Sarrabezolles (1888–1971). The bronzes in the pool and the wall fountains along the side are the work of Claude Grange (1890–1971).
The grotto areas in the side fountain at the Colonnade end of the gardens have a mosaic background, and are reminiscent of many Italian grottoes.