We know of the castle as early as 1223 and what appears today is the result of various transformations that have occurred over the centuries. It appears imposing with its perfect quadrilateral shape, with internal courtyard, partially rammed stone masonry, the two corner towers and the keep. Traces of the towers remain in the protrusion of the bodies but not in the height. In fact, the only one that rises above the rest of the building is the keep, however lower than the origin.
Inside it, perhaps in 1700, the chapel was created. Two L-shaped bodies, two floors high, branch off from the keep, where the servants' houses are located.
At the end of these is the court, the tallest one-storey U-shaped mansion. The courtyard is paved in stone, designed in a radial pattern from the rainwater drainage channels.
The elevations overlooking it are very simple, enriched by an entrance ladder for the servants' homes and a double staircase for the main residence. The top floor of the latter is characterized by small square windows. The doors on the ground floor give access to service rooms which on the side of the courtyard are basements, while on the opposite side they open the windows on the ramming of the castle. In fact, the Rocca appears much higher from the outside.
Inside, the distribution structure has not been altered and maintains its passing rooms; some pavements are also noteworthy.
Along the south side of the building there is an Italian garden full of boxwood and laurel hedges, with terraces and stairways, which adapt it to the slope of the hill. Along the other sides there are large swaths of lawn. Further downstream, to the south, a park of pines and cypresses develops and a swimming pool has been built to the west.
The Rocca di Rasina is privately owned.