Melin yr Ogof Holyhead · Isle of Anglesey · Wales

Melin yr Ogof stands at Kingsland, just outside Holyhead, on elevated ground overlooking the area around the leisure centre. It is also known as St George's Mill or George's Mill. Historic photographs and local records have also associated the site with variant or misunderstood forms of the name, but Melin yr Ogof is the established Welsh name.

The mill was built about 1825 on land belonging to the Stanley Estate. Its builder was Hugh Hughes of Ty Mawr Mynydd, near South Stack. It worked as a corn mill and formed part of the nineteenth-century windmill landscape of Holy Island, alongside other mills connected with the Stanley estate and the agricultural economy of the island.

Hugh Hughes owned the mill until his death in 1869. The mill and much of his other land then passed to his daughters Mary and Margaret. Later accounts emphasise the exceptional survival of the structure and machinery. Melin yr Ogof is described locally and in visitor records as the only unrestored windmill in Wales retaining its original internal equipment. This makes it a particularly valuable survival, because many other Welsh windmills either lost their machinery after closure, were converted to domestic use, or were restored with reconstructed components.

The tower remains a prominent unrestored windmill at Kingsland. Its historical importance lies not only in the survival of the tower itself, but in the retained internal equipment and the continued legibility of an unreconstructed nineteenth-century Anglesey corn mill.