North Stack North Stack North Stack (Welsh: Ynys Arw, meaning "rugged island") is a small island situated just off Holy Island on the north-west coast of Anglesey. North Stack can also refer to the headland opposite the island. This is the site of a redundant fog warning station, comprising a number of buildings, including the Trinity House Magazine, built in 1861, where shells for the warning cannon were stored. These buildings now house a bird watching observatory, giving a view of South Stack lighthouse across Gogarth Bay, and the studio of artist Philippa Jacobs. The Precambrian quartzite cliffs of this headland, including
Woody Island Lighthouses importance of the area for maritime and communication purposes. The Woody Island Lighthouses and Ancillary Buildings Site is associated with Commander George Poynter Heath, the first Portmaster of Queensland (1862–1890), a significant figure in the development of the Queensland lighthouse service. Heath was responsible for supervising the opening of 13 new ports, establishing 33 lighthouses, 6 lightships and 150 small lights and marking the inner route through the Barrier Reef. The place demonstrates rare, uncommon or endangered aspects of Queensland's cultural heritage. The Woody Island lighthouses are further significant as rare examples of twin lighthouses constructed along the Queensland coast.