Satellite radar and underground electrical scans have revealed a 2,600-year-old structure at Buto, one of ancient Egypt's most sacred cities. The real surprise wasn't the walls — but what was underneath them.

https://www.livescience.com/archaeology/ancient-egyptians/buried-for-2-600-years-beneath-nile-mud-a-massive-ancient-egyptian-complex-was-just-found-from-space