The castle of Montorio as a whole includes the remains of the medieval castrum, whose structure dates back to the 10th century, on pre-existing Roman structures; it was then completed in the second decade of the 12th century. Subsequently, during the Scaliger reorganization (second half of the 14th century), it was strengthened and enlarged with the addition of the bastion. The demolition and tampering of a large part of the pre-existing medieval structures is attributed to the nineteenth-century transformation, but it should be remembered that in the Venetian era the castle was progressively abandoned and that already in the eighteenth century it was in ruins and almost in ruins.
The imposing remains of the medieval castle stand on the Montorio hill, the last relief of the ridge that extends to the south; dominating the surrounding plain, now largely urbanised, and establishing an evocative perspective reference in the landscape.