On Cowls Street above Third, you notice something odd about the sidewalks. The ancient pavement has street names embossed in the concrete, but they're different from the names of the streets on the signs. Judging from the dates, the sidewalks were laid from 1911 to 1914.
Here, Cowls is labeled "C", and Cedar is about five blocks East of its present location.
It's kind of a cool mystery which would evaporate if I walked down to the Library and asked someone about it.
I like mystery, though.