A broad spiral ramp led to the top, where a fire burned at night. According to the ancient sources consulted by Thiersch, the lighthouse was built in three stages, all sloping slightly inward the lowest was square, the next octagonal, and the top cylindrical. Much of what is known about the structure of the lighthouse comes from a 1909 work by Hermann Thiersch, Pharos, antike, Islam und Occident. The lighthouse stood on the island of Pharos in the harbour of Alexandria and is said to have been more than 350 feet (110 metres) high the only taller man-made structures at the time would have been the pyramids of Giza. Built by Sostratus of Cnidus, perhaps for Ptolemy I Soter, it was finished during the reign of Soter’s son Ptolemy II of Egypt in about 280 bce. It was a technological triumph and is the archetype of all lighthouses since. Lighthouse of Alexandria, also called Pharos of Alexandria, one of the Seven Wonders of the World and the most famous lighthouse in antiquity. Hear common legends about the Pharos (Lighthouse) of Alexandria on the island of Pharos See all videos for this article SpaceNext50 Britannica presents SpaceNext50, From the race to the Moon to space stewardship, we explore a wide range of subjects that feed our curiosity about space!.Learn about the major environmental problems facing our planet and what can be done about them! Saving Earth Britannica Presents Earth’s To-Do List for the 21st Century.Britannica Beyond We’ve created a new place where questions are at the center of learning.100 Women Britannica celebrates the centennial of the Nineteenth Amendment, highlighting suffragists and history-making politicians.COVID-19 Portal While this global health crisis continues to evolve, it can be useful to look to past pandemics to better understand how to respond today.Student Portal Britannica is the ultimate student resource for key school subjects like history, government, literature, and more.This Time in History In these videos, find out what happened this month (or any month!) in history.#WTFact Videos In #WTFact Britannica shares some of the most bizarre facts we can find.Demystified Videos In Demystified, Britannica has all the answers to your burning questions.Britannica Explains In these videos, Britannica explains a variety of topics and answers frequently asked questions.Britannica Classics Check out these retro videos from Encyclopedia Britannica’s archives.
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