40 Minutes 
In the 14th century, the Savelli family built their castle on the Aventine, thus making the hill an impregnable fortress. The large medieval walls now surround Parco Savello, better known as Giardino degli Aranci, a small rectangular garden very popular because from the belvedere overlooking the river you can enjoy a splendid view of Rome that goes from the bend of the Tiber to St. Peter's Basilica.
The trees that give it its name were planted in memory of San Domenico, who founded his own convent here.
The park was built in 1932 on a project by the architect Raffaele De Vico, who enhanced the space enclosed within the ancient walls. In the enclosure wall, on the side opposite the side wall and the apse of Santa Sabina, the traces of the towers and the drawbridge of the castle are clearly recognizable.
The walls bear the signs of a subsequent refurbishment of the area, carried out at the end of the sixteenth century by the architect Domenico Fontana on behalf of Sixtus V. In addition to the walls, the thirteenth-century castle and its subsequent extensions, only a few granaries and warehouses remain underground, while the building was almost completely demolished in 1613.
Leaving the Giardino degli Aranci, turn right and reach the Piazza dei Cavalieri di Malta (designed by the famous engraver Giovan Battista Piranesi in 1765). From the lock of the door that leads to the Villa dei Cavalieri, you can see the dome of San Pietro, framed by the hedges of the gardens.
