Castel Sismondo, located in Rimini, once belonged to a powerful ruler of the city Sigismund Pandolfo Malatesta. Its construction began in March 1437 of the year. According to historical chronicles, Malatesta himself designed the castle, although it took part and some real architects, for example, the famous Filippo Brunelleschi. Work on the construction of the castle lasted about 15 years.

Initially Castel Sismondo surrounded by a moat with a ravelin at the main entrance, where you could see the heraldic symbol of the Malatesta family and the Gothic inscription «Sigismondo Pandolfo». Thick walls of the castle, according to historians, could withstand the impact of a new firearm, not just in those years has spread throughout Europe. All the towers were turned towards Rimini, since the mid-15th century the castle was located outside the city walls. This feature suggests that, most likely, a popular uprising against Malatesta were not uncommon, and the powerful Lord had to defend themselves against the inhabitants of the city. Once each of the square tower was equipped with a bronze cannon.

The central part of the Castel Sismondo, which consisted of several buildings, served as the residence of the Malatesta. The most beautiful living rooms are decorated with tapestries, frescoes and curtains. Probably had decorated the walls of the residence and external - it says the following majolica, have survived. It is in this castle in 1468, the year Sigismondo Pandolfo Malatesta and died. In 1821, the castle was turned into a military barracks for the local branch of the Carabinieri. Five years later it was demolished the outer walls and the ditch covered with earth. Today, the preserved central "core" Castel Sismondo held a variety of cultural events.