Castle of Ventimiglia, Castle on Mount Bonifato, Alcamo, Italy

The Castle of Ventimiglia is a medieval fortress perched on Mount Bonifato above Alcamo in Sicily. The structure features thick stone walls and a surviving donjon tower positioned at the northwest corner, which forms the main remnant of the complex.

Enrico Ventimiglia, count of Alcamo, claimed to have built the castle on Mount Bonifato as protection against attacks, though some interpretations date it earlier. It was destroyed in 1243 by order of Frederick II and rebuilt at the Ventimiglia family's expense before 1391. In 1340 Frederick III of Sicily assigned it to Raimondo Peralta, count of Caltabellotta. In 1779 Gabriele Lancillotto Castello, prince of Torremuzza, listed its ruins in Sicily's Plan for the Preservation of Cultural Assets.

The tower still standing is the keep, wrongly called "Saracen tower"; it stood three floors high and was entered by a wooden ladder at the first floor. Inside, the ground floor held the rainwater cistern and the prisons, while fires were lit on the top floor to send signals. A legend tells of an underground tunnel once linking the castle to Calatubo.

The castle ruins are accessible through the Nature Reserve Bosco di Alcamo, with parking available at the base of Mount Bonifato. The climb through the wooded terrain is relatively manageable for most visitors.

A local tradition holds that a tunnel once linked the castle with the Calatubo castle. The only remaining tower, wrongly called "Saracen tower", was entered by a wooden ladder at the first floor, and its walls are 2.2 metres thick.