Probably the dinkiest castle you're ever going to see; Kolossi Castle was built in AD 1210 by the Knights of St. John. It is a fine example of military architecture and served as the Grand Command center of Jerusalem's Order of St.
John until being taken over by the Order of the Knights Templar in the 14th century. You enter the castle across a tiny drawbridge, which brings you into a large chamber with a decently-preserved fresco depicting Jesus' crucifixion on the main entrance wall.
A narrow spiral staircase leads you up to the second level with two stone-cut chambers, and then onto the battlemented roof with excellent views across Kolossi village below.