Which ancient wonder stood in Alexandria and was traditionally said to guide ships with a great beacon?

The Lighthouse of Alexandria was the ancient wonder traditionally said to guide ships with a great beacon.

Also called the Pharos of Alexandria, the lighthouse stood on the island of Pharos beside the Egyptian port of Alexandria. Construction probably began during the reign of Ptolemy I Soter and was completed under his son, Ptolemy II Philadelphus, in the early 3rd century BC.

Ancient descriptions portray a monumental tower with several levels and a fire or light at the top. Its height is uncertain, but it was probably among the tallest human-made structures of the ancient world. A mirror may have been used to reflect light, although details in later accounts are difficult to verify.

Earthquakes damaged the lighthouse repeatedly, and its remaining ruins disappeared by the 15th century. The word “pharos” became a term for lighthouse in several languages, including French, Italian, Spanish, and Romanian.