The 7 metre tall white stone obelisk was built in 1844 to warn ships of the rocks off the coast of Portland Bill during the daytime. It stands at the very Southern tip of the Bill, and also acts as a warning of the low shelf of rock extending 30 metres South into the sea. The obelisk sits close to the Portland Bill Lighthouse and remains a popular attraction, as well as being a common viewpoint area, with two coin-operated telescopes available to use on either side of the landmark. The obelisk is made of high-quality Portland stone ashlar and is dated 1844 on its north face, with the panel inscribed TH 1844. It is a three-sided tapering obelisk on high plinth and with pyramidal crown... info from Wikipedia