Known as the Pharos of Alexandria, this towering lighthouse was one of the most ambitious engineering feats of the ancient world. Standing over 100 metres tall, it utilized a massive mirror to reflect sunlight by day and a fire by night, making its light visible for up to 30 miles out at sea. For over a millennium, it was the landmark that defined the Mediterranean trade. However, the monument was eventually undone by the very earth beneath it. A series of massive earthquakes between 956 and 1323 AD severely damaged the structure, eventually causing it to crumble into ruins. Its remains were eventually repurposed into a fortress by local rulers. The site of this legendary wonder now rests partially underwater, serving as a reminder of the fragility of even the most colossal human accomplishments in the face of nature.