Great Castle Head (Pen y Castell Mawr)
| Location | SM 84713 05985 / 51.7112, -5.1176 / cracking.frostbite.robot |
| Established / Rebuilt / Automated / Closed | 1870 / — / ? / — |
| Architect or Builder | James Douglass |
| Height of tower (m) / above sea level (m) / Range (NM) | 5 / 27 / 5 |
| Character | F WRG |
| Optic | Sealed beam lights on roof |
| Owner | Milford Haven Port Authority |
This was built as one of a pair of towers that acted as leading lights guiding ships through the west channel into Milford Haven. The rear tower was replaced by a beacon and day mark on a concrete pole in 1970, but the front one is still in use. A square extension to the front of an accommodation block set on cliffs forming the north shore of the Haven, the light was originally shown through a window, but now sealed beam electric lights operate from the roof.