Into the caves there are two different small shafts; there are two medieval "butti".

At the time, each house had to have one of these shafts in which to throw away bones and inorganic waste material ["buttare" = "to throw away"].

The "butti" have thus become reservoirs of history and what is found provides invaluable information for historians and archaeologists.

The first "butto" is a flask-shaped shaft while the second one is with vertical walls; it was easier to dig, but more dangerous. A series of small holes can be seen on the walls of this shaft; these used to house small beams on which the floor was reconstructed to avoid falling into the "butto".

The medieval pottery fragments [the kiln discards] are found into shafts like these [see the page of the kiln].