The palace complex includes the Cappella Reale, or the "Royal Chapel", the Cavallerizza (horse-shed), the Rotonda dell'Appiani, the Teatrino di Corte ("Small Court Theatre") and the Orangerie. The rooms at the first floor include grand salons and halls, and the Royal apartments of King Humbert I of Italy and of Queen Margherita of Savoy. In front of the palace are the Royal gardens, designed by Piermarini as English landscape gardens.
The Royal Villa was abandoned by the royal family in 1900, after the murder of King Humbert I near the entrance as he returned from an event. The building hosts temporary exhibitions, but lacked a long-term resident or use until July 23, 2011, when the palace complex housed offices from 4 ministries (Economy and Finance, Reforms, Simplifications, and Tourism).