Urban Palimpsests

Mike Kuniavsky has a new post on a specific kind of Urban Palimpsest:

Many Italian towns, such as Siena, still show the traces of the Roman coliseums that dominated their centers two thousand years ago, even though the coliseums and the buildings all around them, are long gone.

Modern cities have this, too, and they learn at an urban level.

Below you will find traces, found from the sky, of the old railroads. The only clues being a string of oddly shaped buildings amid otherwise boringly uninspired architectural site footprints.

I'm curious if there remains any trace of psychic barrier around these routes? Any remaining feelings of "the other side of the tracks" even though the tracks are no longer there?