The park was founded in 1978 to conserve, study and develop the Cultural Heritage on the Dosso dei Castelli (Castle Hill).

During the following years he made an initial record of the petroglyphs of the Rupe Magna as well as those found on the nearby Dosso Giroldo.

The slow, continual movement of the tongues of ice which occupied the valleys of the Adda and the Roasco molded the surface into its characteristic form.

Numerous themes like human figures, including “orants”, armed men and wrestlers, animals, geometrical shapes, cup-marks, rakes and crosses are represented on the surface of the Rupe Magna.

The so called Castello Vecchio (Old Castle) was mentioned the first time in a written document in the year of 1150 as „Castrum Groxi“, but archaeological results indicate a construction date already at about the end of the 10th century.

As early as in 1526 the Castello Nuovo was partially demolished by the new lords of the Valtellina to avoid possibilities of any kind of insurrection.

Some years before in 1512 the three counties Chiavenna, Valtellina and Bormio became part of the Three Leagues (the Grisons) with the status of a subordinated land.

The slopes of the Dosso dei Castelli represent an example of the local tradition in Valtellina to build systems of dry-stonewall terraces for growing wine.