Pompeii was a busy city in what is now Italy. Then, one day, it was gone. That was almost 2,000 years ago. In 79 A.D., Mount Vesuvius erupted. People in Pompeii raced to the sea to escape. The Roman city was buried under a thick layer of ash and rock. Many years later, the ruins of Pompeii were found. The ash had preserved buildings, writing, and artifacts (below). The ruins are still studied and explored today.