The archaeological museum in Naples is stunning. But it contains many mosaics and frescoes hacked out of Roman ruins in the area. We visited two amazing Roman villas in the ancient Roman town of Stabiae, a few miles from Vesuvius (Pliny the Elder witnessed the eruption from there in 79 AD as the town was inundated by ash - he died there, though probably not from the eruption). As of 2013 when we visited, the villas had not been developed for tourism, though a local man gave the two of us a superb guided tour for a few euros. There were plenty of impressive artefacts, but achingly notable were the dozens of missing frescoes, just huge holes in the plaster left in the walls. There was no doubt that many of them ended up in museums.

And don't get me started on the Elgin Marbles.