after a journey of about 30 minutes Declared a UNESCO World Heritage Site in 1999, it was built between 118 and 138 AD. by the emperor Hadrian, in a green area rich in water near Tivoli, the ancient Tibur. The Villa extended over an area of at least one hundred and twenty hectares, including residential structures, spas, nymphaeums, pavilions and gardens. The various buildings were connected to each other, as well as by surface paths, also by an underground road network for vehicles and pedestrians, functional to the services. The richness of the architectural and sculptural decoration of the villa was extraordinary and has been the subject of frenetic and systematic research since the Renaissance. Almost all the main museums and collections in Rome and the rest of Italy, as well as Europe, include among their works examples from Hadrian's Villa. Currently the visitable area is approximately 40 hectares.

Declared a UNESCO World Heritage Site in 2001, it represents a masterpiece of the Italian garden with an impressive concentration of fountains, nymphaeums, caves, water features and hydraulic music. Cardinal Ippolito II d'Este revived the splendor of the courts of Ferrara, Rome and Fointanebleau here and revived the magnificence of Villa Adriana. Governor of Tivoli since 1550, he immediately toyed with the idea of creating a garden on the slope of the pleasure valley, but only after 1560 was the architectural and iconological program of the Villa clarified, conceived by the painter-archaeologist-architect Pirro Ligorio and created by the architect of court Alberto Galvani. The palace was decorated by the protagonists of late Roman mannerism. The Villa was almost completed when Ippolito d'Este died in 1572. Further interventions in the 17th century were followed by a period of decline, until Cardinal Gustav Adolf von Hohenlohe revived its splendor by also hosting the musician Ferenc Liszt (1811-1886).

The Sanctuary of Hercules Victor is one of the largest sacred complexes of Roman architecture from the Republican era (built starting from the 2nd century BC). It is a scenic structure of imposing dimensions, built on a terrace overlooking the Aniene river, along an ancient transhumance route which would later become the Via Tiburtina. The road was incorporated into the architectural complex with a covered path (Via Tecta). The sanctuary consisted of three main parts: the theatre, which exploited the natural slope of the land, a large square delimited by porticoes and the actual temple in a central position in the square and in line with the theatre. Following the decline of the place of worship, the presence of water pipes favored the establishment of mills, armories and foundries, of the first hydroelectric power station from which alternating current was remotely launched and, finally, of a paper mill.

Villa Gregoriana is an immense park in Tivoli, near Rome, granted on loan to the FAI by the Italian State and the result of an important hydraulic engineering work whose objective was to contain the flooding of the Aniene river. Promoted by Pope Gregory XVI in 1832, from which it takes its name, once the water tunnels were made and a waterfall was created, the Pope decided to build a park around it, thus creating a new place where one could experience the relationship with nature and the sublime, or nineteenth-century Romanticism. Its fame consecrated this place as a destination for nineteenth-century European travelers and a favorite subject of painting of the time.