It didn’t take long for a few cluey people to offer good suggestions about yesterday’s photo.
It was indeed in Naples, in the Bourbon Tunnel. You can read about its history in the link below. And it was a sort of museum, John.
My vivid fragments from the tour included the two different offerings of toilet facilities when the tunnels were used as air-raid shelters during the Second World War. I would have been using the basic model, with nary a trace of privacy supplied, while the posh among us would have at least had the comfort of a wall between you and your neighbour. The other was the many rusting automobiles which had been impounded for one reason or another!
I’ll find another photo to post tomorrow, or the next day.