Around Rome, I noticed many numbered tiles (most with four digits, and all with a white background and blue text) around the city. An example is shown below on the right of the image.

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Some of these tiles were placed at the entrances of historically important buildings (for example, Santi Quatro Coronati has a numbered tile), but many were at addresses with no discernable importance. I also verified that the number on the tile did not correspond to the street number. (This is evident, for example, for the property in the picture above; the street number is 28).

What is the significance of locations with these tiles? Is there a system behind their numbering / a list of all the locations of the tiles? More images are available in this album.

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    I realize that this may not be the most appropriate site for this question (I considered posting it on Travel too); if there is a more appropriate site I'd appreciate knowing! – Vincent Tjeng Jan 27 '18 at 10:30
  • Indeed in travelexchange: travel.stackexchange.com/questions/95009/… (but by the answer it is clear that the question is on-topic here). – SJuan76 Jan 27 '18 at 10:50
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    I'm voting to close this question because it's already answered on another SE, as another comment indicates ("Duplicate" closures are required to be on this SE). – Spencer Jan 27 '18 at 16:59
  • @SJuan76 what search term did you use to find this? (or did you know about it before hand) – Vincent Tjeng Jan 27 '18 at 22:15
  • number wall. I did recall seeing some question about strange numbers, but I did not remember if it was specific to Rome. – SJuan76 Jan 27 '18 at 22:42

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