Royal Garden in La Granja de San Ildefonso

This huge Royal Garden is associated with the Royal Palace in La Granja de Ildefonso, Spain. Here is a short explanation of the Garden from Wikipedia: Royal Palace of La Granja de San Ildefonso.

Extending over 1,500 acres (6.1 km2), the gardens around the palace are one of the best examples of 18th-century European garden design in the Jardin à la française style in Spain. [7] The French designer from the official French royal offices of Robert de Cotte was René Carlier,[8] who used the natural slope of the site in the palace grounds design, for enhancing axial visual perspectives, and to provide sufficient head for water to shoot out/up from the twenty-six sculptural fountains in the formal gardens and landscape park. 

Sculptors arrived from Paris to execute designs on the site. They included: René Frémin (1672–1744, at La Granja until 1738), to whom the execution of many vases and sculptures was attributed in 18th-century inventories; Jean Thierry; and others who are little more than names in archival references.

This is one of the largest such gardens I have ever seen. I could have spent days and weeks visiting each part of the garden and seeing the huge variety of plants and trees.