Satellite surveys have revealed a massive 2,600-year-old complex buried beneath the Nile at a sacred ancient Egyptian city.
Researchers discovered the structure using new technology designed to locate structures buried deep beneath the surface.
Archaeologists were initially studying the ruins of an ancient city, Buto (Tell el-Fara'in), that was occupied from the Predynastic period around 3800 BC to the Early Islamic era of the 7th century AD.
