St. John's Point, Co. Donegal. There are two St. John's Points with lighthouses in Ireland. The one you see here and one in Co. Down, Northern Ireland.
The one in this photograph is at the end of an 11-kilometre-long peninsula, probably one of the longest in Ireland. The light started functioning in 1831 and was converted to automatic operation in 1932—one of the first in Ireland to undergo the process.
This was the last photograph I took for my book 'Atlantic Light'.
(You can buy a print of this photograph at: https://buff.ly/2E1fHnp)