The Orte Underground complex, situated beneath the historic centre of Orte, is a significant example of human-made stratification within a tuff hill. This underground system illustrates the evolution of water management techniques and the use of subterranean spaces from Etruscan times to the present day.

The tour begins at the Underground fountain, a 17th-century structure that leads into a complex network of tunnels dug from the 6th–5th centuries BC. These tunnels, of Etruscan-Roman origin, were designed to collect and channel rainwater and spring water into large cisterns located beneath the dwellings.

Within the approximately 350 metres currently accessible, visitors will encounter sites of great historical and archaeological interest, including the medieval Fratini cistern, the Roman-era Cocciopesto well and the 18th-century ​Vascellaro chamber.

The route then continues above ground, through the medieval urban fabric, before leading back underground along the northern slope of the hill, overlooking the Tiber valley. In this area, the medieval Dovecotes, structures used for breeding pigeons, can be seen.

On the southern side, which is better preserved in its medieval form, visitors can access the rooms of the Confraternity of the Raccomandati and its 14th-century hospital. Here stands the Snow Well, historically used for storing ice and medicines.

Finally, on specific occasions (every third weekend of the month), it is possible to visit the Renaissance Nymphaeum, the jewel in the crown of the underground complex,

A journey through the centuries, discovering the city’s thousand-year history.