The old Ferris Point lighthouse. I'm guessing this photograph is probably 19th century, due to the fashion and the fact that the lightkeeper's dwelling appears to be single-storey. The lower photograph was taken shortly after the two people and the dog fell down a large sink-hole.
A lighthouse was first established on the southern entrance to Larne Harbour on 1st February 1839 on a headland named Ferris Point, Farres Point or any variation of the two. It is also called Larne lighthouse or Islandmagee lighthouse, sitting as it did on the northern end of that peninsula, bookended by Blackhead lighthouse at its southern point.