In 79 AD, Italy's Mount Vesuvius erupted, burying the ancient cities of Pompeii and Herculaneum under a thick layer of volcanic debris. Nearly 1,700 years later, in 1752, researchers found over 1,800 rolled papyrus scrolls inside the library of a Herculaneum mansion. The scrolls' exterior was severely charred by the intense heat. But due to the lack of oxygen, the interiors remained well-preserved.