If you want to find lost cities or the traces of ancient civilizations, Sarah Parcak believes you need to head into space.
New technology allows her to see under dense rain forest to the ancient historical secrets beneath. "The scale and size of some of these cities is so much more than we could ever have imagined," says the self-described space archaeologist.
"When I look at the past and see what we've accomplished, that gives me great hope for the future," she says.