US authorities recovered an illegally looted mummy, and they wanted to return it. Big problem: They didn’t know where it was from. Enter Sarah Parcak, an Egyptologist and expert in the relatively new field of space archaeology. Here, she explains how she and a team unravelled the mystery.

Ancient Peru was home to many cultures, most of them still mysterious. But as Sarah Parcak points her satellite-archaeology lens (and her new citizen-explorer project) at the Peruvian wilderness, the invisible past is primed to make a remarkable comeback.