My TV was on as a bit of background noise instead of the radio , and then I became aware of the program being televised , the raising of city blocks in Chicago by screw-jacks , and people were working , living , shopping ,coming and going as if nothing was unusual .
And all this was happening in the 1860`s as a result of health problems experienced through lack of drainage etc.for sewerage and what not.
Absolutely worth a google look .
smiddy