quarries to form the longest breakwater in Britain, at nearly 1+1/2 mi long. There are also the remains of a brickworks, which closed in 1973. Specialist bricks produced here were also used in construction of the breakwater.

Holyhead Mountain attracts many visitors, and it is close to South Stack lighthouse; many people come to see the variety of birds that nest along the cliff faces near South Stack. Views from the summit are extensive, especially to the west, where