Cats of Pompeii (and surrounds)
Herculaneum
Herculaneum
This is Herculaneum. Before being covered in ash and lava, it was a resort town, of about 5000 people. Smaller than Pompeii and only a small amount has been excavated. This site you could easily visit in 2-3 hours. (For that and what I mention below, some people prefer visiting here to Pompeii.)
As you enter the ruins, you cross a bridge with this view.