Beneath the baronial palace runs a series of tunnels and galleries that has carried water for centuries. Probably already used in Roman times, the aqueduct declined badly in the Middle Ages, so much so that it was forgotten. Although it remained in use over time, maintenance was minimal, and landslides and damage had almost completely exhausted the flow of water.
The aqueduct was only rediscovered in the 20th century, when, after the local drinking-water spring disappeared, sanitation works were carried out and the aqueduct channel came to light again. The tunnels, damaged by landslides and time, were restored in the following years with brick buttresses. But only in the mid-1930s were more lasting works carried out, aimed at creating a municipal aqueduct to replace the costly and inconvenient tanker trucks brought every day to the entrances of the town.
The route runs beneath Piazzale San Francesco: at first it follows a brick-lined stretch reworked in the last century, then an older part actually carved into the rock. A particular feature is the cistern visible through a grating under the car park (and the newsstand) of Piazzale San Francesco.
