 Kisimul Castle at Castlebay is the hereditary seat of the MacNeils.It is located on an island in the bay, so giving the village its name.Other places of interest on the island include a blackhouse museum, a ruined church and museum at Cille Bharra, a number of Iron Age brochs such as those at Dùn Chuidhir and An Dùn Bàn, and a whole range of other Iron Age and later structures which have recently been excavated and recorded.