In far southwestern Ireland, in fact the farthest southwestern point of Ireland, is the Mizen Head Signal Station and Visitor's Centre at the end of the Mizen Peninsula. Do not miss this if you are ever in western County Cork. The ride out to it and back would be worth the ride even if this reward were not at the end.
The station was established in 1909. At that time it was done with an explosion once every three minutes in foggy weather, which must have been rather exciting. The Visitor's Centre tells the long history of the station after that. But the real star of this "Great Irish Spot" is the beauty of the location. Rather than have me try to describe it with mere words, check out the photos below, and the then watch the video from the Mizen Head Signal Station website.