Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Sostratus of Cnidus (born 3rd century BC), was a Greek architect and engineer. He designed the lighthouse of Alexandria, one of the Seven Wonders of the World (ca.280 BC), on the island of Pharos off Alexandria, Egypt. The Lighthouse of Alexandria, also known as the Pharos of Alexandria, was a tower built between 280 and 247 BC on the island of Pharos at Alexandria, Egypt. Its purpose was to guide sailors into the harbour at night time. With a height variously estimated at between 393 and 450 ft (120 and 140 m), it was for many centuries among the tallest manmade structures on Earth. It was one of the Seven Wonders of the Ancient World.

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