Beautiful and suggestive source, the "Acqua Usignolo". Hidden by a narrow and dark tunnel that can be accessed one at a time, at the end of the short tunnel, of short length but dark because it is elbow-shaped, you come out in a small open-air opening, of very little width, in which two, three people at most can fit, and from the wall of which the water comes out through a pipe. I suggest bringing a torch or a headlamp because the access tunnel, although short, is very dark because it is elbow-shaped