The Organ Fountain was famous for the hydraulic-pneumatic technology that made this water-and-air-powered musical fountain possible in the 16th century. It was recently cleaned and restored so it again produces sound.

Villa on the edge of the town, famous for its fine gardens with their spectacular fountains and waterworks. In 1550 Ippolito II d'Este (i), Cardinal of Ferrara, was appointed governor of Tivoli. He decided to transform the governor's residence located in a portion of an old run-down Benedictine monastery attached to S Maria Maggiore into a lavish villa with splendid gardens devised by Pirro Ligorio. By using ancient statues, some excavated from Hadrian's Villa which is nearby, and contemporary fountain sculpture, Ligorio devised an elaborate iconographical garden layout celebrating the Cardinal. The villa itself is, in architectural terms, somewhat plain. Ligorio did, however, execute a fine staircase loggia on the garden front.