History of the Palace of Versailles but was never finished due to the king's death. Significant among Louis XV's contributions to Versailles were the "petit appartement du roi"; the "appartements de Mesdames", the "appartement du dauphin", the "appartement de la dauphine" on the ground floor; and the two private apartments of Louis XV – "petit appartement du roi au deuxième étage" (later transformed into the "appartement de Madame du Barry") and the "petit appartement du roi au troisième étage" – on the second and third floors of the palace. The crowning achievements of Louis XV's reign were the construction of the Opéra and the Petit Trianon.
Petit Trianon the 1760s and onward. Essentially an exercise on a cube, the Petit Trianon attracts interest by virtue of its four facades, each thoughtfully designed according to that part of the estate it would face. The Corinthian order predominates, with two freestanding and two engaged columns on the side of the formal French garden, and pilasters facing both the courtyard and the area once occupied by Louis XV's greenhouses. Overlooking the former botanical garden of the king, the remaining facade was left bare. The subtle use of steps compensates for the differences in level of the château's inclined location. Marie Antoinette