evidence: Learn more about the construction of the Antrim Coast Road by William Bald, and the famous Black Arch near Larne. The Blackcave Tunnel sits on the Antrim Coast Road just outside Larne. The cost road has been described as one of the word’s most scenic drives. [...] The road remained almost entirely unchanged from 1842 until the 1960s, when in 1967 there was a major fall of rock onto the road south of Glenarm. Around this area the cliffs are c. 100m high, so Antrim County Council decided to build a new road next to the older one, but further out to sea. The council reinforced the road with rock armour and work was completed in 1970.