How many basalt columns make up the causeway between Causeway Head and Benbane Head?
Benbane Head Benbane Head, or Benbane (), is the northernmost point of mainland Northern Ireland. It is in County Antrim, near the Giant's Causeway, which lies between Causeway Head and Benbane Head. The nearest settlements are Bushmills and Portballintrae.
Dumbarton Castle Dumbarton Castle (Scottish Gaelic: "Dùn Breatainn" , ] ) has the longest recorded history of any stronghold in Scotland. It overlooks the Scottish town of Dumbarton, and sits on a plug of volcanic basalt known as Dumbarton Rock which is 240 ft high.