but sarah parcak, a well-known egyptologist, is convinced most of ancient egypt remains undiscovered.'s digging for the main burial chamber. parcak is adept at this old school archaeology, but she's ushering in a new school of the science. she's making discoveries from 400 miles above the earth, while sitting at her desk. she gets infrared photos from digital globe, a commercial satellite company, and looks for shapes, like circles and squares, not usually found in nature and not easily visible on the ground, that indicate human activity. so what have you found? >> parcak: a lot. i'm at the point where i can't keep track. >> whitaker: parcak has found more than 3,000 ancient settlements in egypt; roman sites across europe and north africa; viking sites in iceland. >> parcak: so, we're going to look up here. >> whitaker: one of her early important finds was in a farm field near the ancient roman city of portus. it's a site in italy where archaeologists have been digging for a decade, but hadn't been able to find the city's amphitheater-- until sarah parcak looked at the satellite photo