The castle is located at the Southern end of the village of Kolossi, which is located on a coastal plain about 11 kilometres West of Limassol. It is one of the most important fortification works of the Frankish period, an imposing well-built square building consisting of three floors. The castle was built in 1210 by the Order of St. John of Jerusalem (Hospitaller Knights) as the seat of the supreme military commandment (Grande Commanderie). In 1306 he briefly came into possession of the Knights Templar, who supported Amalrique of Tire, the usurper of the throne. After the abolition of the Knights Templar in 1313, the castle of Kolossi returned to the possession of the Knights Hospitallers, but was destroyed during the incursions of the Mameluke tribes in 1525-26. The Grand Commander Louis de Magnac built the existing castle on the ruins of the 13th century castle. The coat of arms of Magnac can be seen together with the emblems of Jerusalem, Cyprus and Armenia as well as with the old coat of arms of Lusignano in the East part of the castle and a fresco on the second floor.

The remains of a factory that produced sugar from sugar cane, grown on large plantations in the region, are located East of the castle. The plantations, which date back to the 14th century, consisted of three main areas and other auxiliary areas. The primary structure is the sugar refinery, a long, narrow, stone hall covered with arches. To the North of this room are the ruins of the water mill and the water tower.