In California, the story goes, anything over 50 years of age merits the title "antiquity"—I suppose that includes me! On the East Coast the # is more like 100 to 150 years. (Of course, that blithely ignores the fabulous Spanish settlements in what became California—that pre-date by 100 years the Pilgrims not landing at Plymouth Rock in 1620.)
But that's not my point.
My point is ... Athens. It is, yes, bizarre and wonderful—in a nondescript square, one casually comes upon a little sign tacked to a wall: "Façade of Hadrian's Reservoir."
Now that's antiquity!
(Sorry—no photo. I forgot my camera on that walk, but I did take a note.)