Archaeologists have encountered a mysterious structure beneath the ruins of an ancient city while testing out some new scanning equipment in the northwest Nile Delta of Egypt. The ancient city has held many names in the nearly 6,000 years since it was established. Ancient Egyptians named it Per-Wadjet, as it was a site sacred to their snake goddess Wadjet; during ancient Greek occupation of Egypt, beginning 305 BCE, it was called Buto ; now, the site of the city's ruins holds the Arabic name