Castletown is a village on the north coast of the Highland council area of Scotland, situated near Dunnet Bay. It is within the civil parish of Olrig, where it is the main settlement, and within the historic county of Caithness. The A836 links the village with Thurso and Tongue in the west and with John o' Groats in the east. The B876-A99 links the village with Wick in the southeast.Much of the village is built on the old townland of Stanergill. The Stanergill Burn was the eastern boundary of the townland. It flows now through the eastern end of the village and so into Dunnet Bay and the Atlantic Ocean.The name Stanergill can be read as meaning Stone Valley and much of Castletown was built during the 19th century boom years of Caithness as a source of flagstone. Much of the stone was processed in the harbour area of the village, known as Castlehill, and many of the streets of London, Sydney, Edinburgh and the financial district of New York City are paved with it. The harbour was built by James Bremner. Castletown's main building is the 'Drill Hall'. This is mainly used for parties, discos and small clubs such as the indoor bowls. The building that was used for these functions was the 'Traill Hall', a gift to the Village by the Traill family, owners of the flagstone quarry at Castlehill. Traill House, a large and imposing country home was the residence of the Traill family. It was located in the woods at Castlehill, in later years it was owned by the Crumb-Ewing family, it became derelict after WW2 and burned down in the late 50's. The remains of the gatehouse can be seen on the side of the A836 at Castlehill plantation.