An Algorithm Revealed 200 Lost Paintings on Angkor Wat's Ancient Walls

Even a building as famous and photographed as Angkor Wat has its secrets. With the help of an image enhancement algorithm, a sharp-eyed rock-art researcher has revealed that unassuming smears of pigment are actually faded drawings. It could be graffiti--or it could be the remnants of a concerted 16th century restoration program.