Buen Retiro Palace
The Buen Retiro ("nice retreat") was originally a royal hunting ground converted into an exclusive royal park for Felipe IV's Buen Retiro Palace, which spread over . The palace was largely demolished after the Peninsular War, with only Casón del Buen Retiro (a ballroom) and Salón de Reinos (used as a throne room) still existing, and the park has been open to public since 1868.