Dunlus Castle, Ireland Attractions. Dunlus Castle, Antrim (County Antrim) is located on the coast of Antrim County, originally occupied by the MacQuillan family and later owned by the MacDonnells family, which was surrounded by the English in the 16th century. 55 miles southwest of Trim is the village of Clareen, where Lip Castle is said to be the most haunted castle in Ireland. Since the 14th century, it has been the gateway to Munster from Mount Bloom. There is an unpleasant elf in the castle, and even the famous poet Yeats claimed to have seen the elf during his stay!