Introduction to the Lighthouse of Alexandria: The ruins of the Lighthouse of Alexandria are located on Pharos Island near Alexandria, Egypt. In fact, this tall and spectacular lighthouse is not really on the island, but is built on a large rock seven meters away from the island. The rocky reefs disappear and appear with the rise and fall of the sea tide, causing the entire lighthouse building to withstand the beating and erosion of the waves for many years, as if a towering building was pulled up in the sea. There is a huge, radiant lighthouse torch on the tower that never goes out. The lighthouse is 120 meters high, and including the tower base, the entire height is about 135 meters. The tower consists of three floors: the first floor is a square structure, 60 meters high, with more than 300 rooms of varying sizes, used as fuel depots, machine rooms and staff dormitories; the second floor is an octagonal structure, high 15 meters; the third floor is a circular structure with 8 stone pillars 8 meters high surrounding the dome light tower. On top of the lamp tower stands an 8-meter-tall bronze statue of the sun god Helios in a standing posture. The entire lighthouse is built with materials such as granite and copper, and the fuel for the lamp is olive oil and wood. Smart designers also use the principle of reflection to use mirrors to reflect light farther out to sea. This unparalleled lighthouse is brightly lit every night and works conscientiously to navigate ships entering the harbor. In addition, it was also the tallest building in the world at that time.