Rocca di Ravaldino was the heavily walled and cannoned fortress of Forlì, a citadel of strategic importance to the defense of the city. The Apple of Eden was briefly held here for safekeeping upon its recovery by the Assassins' Order. It serves as a Secret Location.
Trivia
Caterina Sforza, who is featured in the game, was Countess of Forlì from 1480 until 1500. Her legendary quotes are featured in the Battle of Forlì DLC. In 1488, her husband, Girolamo Riario, was assassinated in a conspiracy led by the Orsi, a noble family of the city, and she and her children were made prisoners. Since the fortress of Ravaldino refused to surrender, Caterina Panoramic view of Forlìoffered to go to convince the Castellan, Tommaso Feo, to yield. The Orsinis believed the good intentions of Caterina because she left her children as hostages, but once inside the safety of the fortress, she let loose a barrage of threats and promises of vengeance against her former captors. When they threatened to kill her still-captive children, she exposed her genitals from the fortress walls saying: "Ho con me lo stampo per farne degli altri!" (I have the instrument to bear more!).
Forlì was a very provincial town, but the Fortress of Forlì was one of the most fortified citadels in Italy, one that was protected by numerous, very large cannons. In Assassin's Creed: Renaissance, when the Orsi Brothers attack Forlì, Caterina Sforza is forced to order the cannons to fire at enemy targets inside the town walls. As a result, parts of the city were destroyed.
It is in Forlì that the player can dye Ezio´s robes with the tints "Wetlands Ebony" and "Wetlands Ivory" to achieve the "Perfect Harmony" Trophy/Achievement.
Forlìis one of the two locations that you can use the Flying Machine (considering you have obtained the Battle of Forlì DLC), and the only one where it can be used at any time.
Map of Forlì and surrounding areas
