Tivoli, Italy, is home to two UNESCO World Heritage Sites -- Hadrian's Villa (an emperor's estate from the century) and some of the most spectacular gardens and fountains ever built at Villa d'Este. They're an easy day trip from Rome.
Villa d’Este – Tivoli Italy. The Villa d'Este is a villa in Tivoli, near Rome, Italy. Listed as a UNESCO world heritage site, it is a fine example of Renaissance architecture and the Italian Renaissance garden.
Villa Adriana - Tivoli, -outside of Rome--- Via di Villa Adrianna exclusive retreat for emperors. Almost years old, took 12 years to build. Art and sculptures are now displayed in the Museo Nazionale Romano.