The tour of the Palmenti di Pietranico is a circuit created for the visit of ancient tanks, huge outcropping rocks scattered over the territory that, worked with extreme skill, were used as tanks to make wine directly on the fields. Thus the peasants brought home only the must, leaving the processing waste directly in the countryside, avoiding the effort of transporting to the farms material that would not produce wine and thus fertilizing the same fields. The millstones are one of the best testimonials to understand the refined level reached by local artisans and the enormous size that the production of fine wines had achieved in the territory. In the Municipality of Pietranico there is the highest concentration of millstones excavated in the rock in Abruzzo, located on the west-facing slope dominated by the town.