On the first floor, walking along the balcony of the Aldobrandesco Castle, we find the "Museo delle Armi", a private collection donated by the retired former marshal Emo Mecheroni, a collection started by Mecheroni with the collaboration of his father and created with passion and competence in the arc of all life.It includes a precious stalls of ancient weapons, which tell the story of various cultures, societies, populations, from the Middle Ages to the early 1900s.

175 pieces are on display: 164 guns and slashing weapons belonging to various eras and various cultures, 10 helmets of different shapes and origins and an animated stick. In the museum there are different types of white weapons used in the period from the Middle Ages to the Renaissance and muzzle-loading firearms, with flintlock and nipple, in use from 1600 to 1800, which were supplied both to personnel and to the army, also the Napoleonic and Garibaldian one.

Furthermore, an interesting section displays exotic weapons, mainly from Africa, North Africa and India.
Pieces all cataloged by the collector and which are now exhibited in special showcases with related explanatory panels.

Recently acquired (2020), the collection was judged by the experts of the Stibbert Museum in Florence to be of great value due to its rarity, value and historical importance. The Municipality of Arcidosso received this collection as a donation with great pleasure, since it goes to implement the prestige of the already conspicuous material and archival heritage housed in the castle, both to ensure the protection and adequate conservation of these assets and to make them available to all enthusiasts and visitors.