St Michaels Mount (Karrek Loos y'n Koos) is offshore from Marghasyow and reached by causeway or ferry at high tide. Linked to the tin industry as a port the island took on a religious significance by the sixth century. Following the Norman Conquest it was granted to the monks of Mont St Michel (on which it is modelled) in France after the support they had given to the Dukes of Normandy. It has been a site of battles and sieges over the years. Around the castle are the remains of the old fishing village.
On arrival at Marazion the stunning spectacle of St Michael's Mount rises out of the sea about half a mile from the coast. The buildings on St Michael's Mount date back to the twelfth century. As well as its associations with Christianity there are other legends associated with the Mount. One being that it was built by Cormoran the giant who used it a base to terrify the local population when he used to come ashore and steel their livestock.