from the FAI website "In the territory of the Agro Tiburtino Prenestino you can get to know Ponte Lupo, the most impressive stretch of the Aqua Marcia, the longest aqueduct of ancient Rome (about 91 km), built by Quinto Marcio Re between 144 and 140 BC, famous for the freshness and clarity of the water collected from the springs of Marano Equo, between Agosta and Arsoli. Even though it ran underground for over 80 km, it was necessary to build some bridges to overcome the valleys intercepted by the aqueduct. Ponte Lupo it was built to cross the Red Water Ditch, the legendary place where the battle between Horatii and Curiazi took place, renamed in the 19th century "valley of the dead" due to the abundance of human and archaeological finds discovered at the time. , has been the subject of several renovations and restorations, testifying to a use that lasted at least ten centuries. The final result is a composite work artefact, a diachronic palimpsest of construction techniques, approximately 115 meters long, often over 18 meters and surmounted by a driveway that runs at a height of over 30 metres. After a very long period of oblivion, Ponte Lupo was rediscovered and studied at the end of the 19th century by the British archaeologist Thomas Ashby, who stated "This bridge is the most famous and most interesting of all the aqueduct bridges".