The ancient world was home to incredible inventions and advanced technologies from various civilizations. These innovations include the steam engine attributed to the Hero of Alexandria, the Assyrian Nimrud Lens, the oldest calendar in Scotland, the superior quality of ancient Roman concrete, metal coatings from medieval artisans, Zhang Heng's earthquake detector, the mythical sunstone used as a navigational device, the Baghdad Battery, the 1,600-year-old Roman goblet that reveals early knowledge of nanotechnology, and the enigmatic Antikythera Mechanism. These ancient inventions showcase the remarkable expertise and ingenuity of our ancestors. https://www.ancient-origins.net/ancient-technology/amazing-inventions-001539