When Captain James Cook sailed the Hawaiian Archipelago in 1778 he saw no man-made aids to navigation. In today's Hawai`i however, hundreds of modern aids such as lighthouses , buoys and radio beacons are in operation to assist the sea traveler.
One of the more senior of these Hawai`i aids to navigation is the automated Diamond Head Lighthouse, located on a steep cliff on the south side of O`ahu. One of the best-known beacon lights in the Pacific, it stands as a sentinel to Honolulu, flashing a welcome to mariners from the east and west.
Built on the side of the extinct Diamond Head Volcano, the original lighthouse structure was erected in 1899, and is surpassed in longevity in Hawai`i by only the Aloha Tower Light, built in 1870