The castle was first mentioned in 1294 and it was owned by Gyula Siklósi. In the course of the years, many noble families reigned in the castle. The Count Kázmér Batthyány was the most famous one in the first half of the 19th century.
The current castle territory is created by a baroque palace from the 18th century surrounded by bulwarks and forts. The castle can be accessed through a draw-bridge that leads to the gate with crenels and peepholes. There are four towers in Siklos Castle connected by a gazebo. The castle palace is a three-floor building. The southern wing includes a castle museum, jail and cellar lapidary. You can see an exposition on the manufacture of gloves, fans and umbrellas in the museum. The first floor in the palace serves as a modern art gallery and an interesting Zsigmond Hall can be seen there, too. It has a Lierne rib vaulting and a renaissance fireplace. In the year of 1401, Sigismund, Holy Roman Emperor, was imprisoned in this hall. The second floor is a place of a ceramics exhibition by István Gádor. The walls in the castle jail are several meters thick and there are five rows of bars in the windows. A Gothic chapel with a net vault and frescoes from the 15th century is also a part of the castle.