There is still much of ancient Pompeii left unexplored under the site of modern Pompeii. A great short film on this is Pompeii: The Last Day. It was a made for TV movie, but still very well done and even shows Pliny the elder going to try to rescue his friends.

This is at the top of my bucket list: to go back to Pompeii for a couple weeks; take every guided tour there is, so I become as familiar with it as possible; then just spend a few days walking around by myself.

#4 They knew volcanos: Etna, Lipari, Vulcanus ( whom the generic name comes from). It's just that they didn't knew Mount Vesuvius was one.

#1 No lava in Pompeii at all, ever. Pyroclastic flow only.

What is not told, that pompeii was a lust city full of gays, that's why God destroy it. But these kind of truth is never unveiled to public so they will still blind