The marvellously ornate stack at the top of Cape Cornwall.  Usually stacks were built from granite rubble with the top section made from brick.  This was restored by the old Manpower Services Commission with funding from the Heinz Foundation, which also bought the Cape (and other parts of the coast here) and donated it to the National Trust.  This is listed as a Grade II* structure, however it was not always so well appreciated:

Mines in general, always excepting Botallack, which clings to the sea-crag as if it really was of Phoenician origin, are ugly enough; but why should a London company have gone about, at ruinous cost, to set a regular unmittigated [sic] factory chimney on the very top of Cape Cornwall, “with the view of improving the land-scape"?

Quote from the Cornish Telegraph 14 June 1871