Somewhere between 10,000 to 20,000 people lived in Pompeii in 79 AD. Consequently, the town’s landscape was filled with homes, shops and public buildings. Almost all are now in ruins with only their foundations visible. Plan on spending three to eight hours exploring this UNESCO World Heritage Site. Then if you want to learn more, I strongly recommend two excellent websites. AD 79 Eruption by Peter and Michael Clements. Also Pompeiiin Pictures by Jackie and Bob Dunn.