In 1738,workers were building a palace when they discovered an important building that used to be part of the ancient city.Soon after that,experts began to excavate pompeii.Today,we know a lot aboute that terrible day."The thick ash turned everything black,"says Pompeii expert Andrew Wallace-Hadrill."People couldn't see the sun.All the landmarks disappeared."The people could not see where to go or how to escape.Some people took money and jewelry and ran for their lives.Other people hid and because trapped in the homes.The ash did not stop falling.It got deeper and deeper,blocking doors and destroying buildings.