Wadjemup Lighthouse, Limestone lighthouse on Rottnest Island, Australia.

Wadjemup Lighthouse is a limestone tower rising above the highest point of Rottnest Island. The structure features an observation platform and a rotating light beam that reaches far across the ocean on clear nights.

The original structure was built in 1849, then replaced in 1896 by the current building. Both versions served as important navigation aids that helped make Western Australian waters safer for ships.

The first tower was built with limestone quarried locally and labour of Aboriginal prisoners held on Rottnest from 1838; Stokes noted the lighthouse as their work. The first keeper, Samuel Thomas, was appointed in January 1849, two years before the light was lit, and ran flag and flare signals relayed to Fremantle.

Visitors can climb stairs during guided tours to reach the observation platform and enjoy views across the Indian Ocean and island. It is best to wear comfortable shoes and allow time for the visit, as the vista rewards the effort.

The 1896 tower was designed by English engineer William Douglass, with a 34-metre limestone shaft on a 13-metre octagonal concrete base; the stone came from a quarry on Rottnest Island itself. Its first lantern held four mineral-oil burners made by Chance Brothers of Smethwick, near Birmingham.