Ponder Pompeii
Ticked off in October 2011
What it is
Pompeii was buried by the eruption of Vesuvius in AD 79, preserving a Roman city.
How to do it
Take the Circumvesuviana train from Naples or Sorrento. Allow at least half a day; a guide or audio guide helps.
Top tip
Herculaneum nearby is smaller and even better preserved.
My experience
Ticked off, but the full story is still to be written up.