Charles VII of Naples commissioned the Reggia di Caserta in 1751 with a direct brief: outdo Versailles. His architect Luigi Vanvitelli delivered — 1,200 rooms, 1,742 windows, 34 staircases, and an axial garden three kilometres long ending in a 78-metre cascade down the face of a mountain. The palace opened in 1780; the gardens took another fifty years to finish.
The royal apartments hold some of the finest Bourbon-era interiors in Europe — the Throne Room with its 44-metre ceiling fresco, the court theatre, the royal chapel modelled on Versailles, and the private apartments preserved largely as Queen Maria Carolina (Marie Antoinette's sister) left them. The Scalone d'Onore, the grand staircase, is what even seasoned palace-goers stop dead in front of.
The park is the other half of the visit. A canal runs 3 kilometres from palace to the base of Mount Tifata, broken by five colossal fountains and ending at the Cascata Grande with a marble tableau of Diana and Actaeon. George Lucas shot Naboo's royal palace here (Episodes I and II). It's also the one Italian site where bringing a bike or the shuttle makes the difference between seeing the gardens and giving up halfway.