The name 'Needles' is believed to have been derived from a slender tapering rock pinnacle which was formerly situated a little to the north (i.e. on the Alum Bay side) of the present central rock. This needle-shaped rock, about 120ft high and known as 'Lot's Wife' collapsed into the sea in 1764 with a crash which was said to have been heard many miles away! The stump of this pinnacle can still be seen at low water where it forms a dangerous reef.
The present lighthouse, 109ft high, clings to the base of the most westerly rock of the Needles group. It started working on 1st January 1859, taking over from the original lighthouse on the cliff top.