The huge Etruscan well, built in the second half of the third century BC, is a great example of Etruscan hydraulic engineering, and it is an archaeological and historical landmark of the city that attracts many tourists every year, as it was one of the main public water reservoirs in the city in Etruscan times and Roman, and its depth ranges between 12-37 meters, and it is supplied with spring water and rain water collects in it. Visitors can reach the well head and walk through a modern glass and steel corridor.