Pharos Lighthouse
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The Lighthouse of Alexandria, more commonly known as the Pharos Lighthouse, was a wonder of Alexandria similar to the Library of Alexandria. Barbara Wright was never as interested in wonders like the Lighthouse, instead being more concerned about the people. (PROSE: The Book of Shadows) The Fourth Doctor referred that slaves were employed to keep its bonfires going. (TV: Horror of Fang Rock)
The Pharos Project in 1981 was named after this structure, as Tegan Jovanka explained that "Pharos" was ancient Greek for "lighthouse." (TV: Logopolis)