Update: I went back in the spring of 2019.
There’s a strange little pocket of what was once a much larger neighborhood south of downtown, which is nowadays called LaSalle Park, but was part of the larger Frenchtown quarter of the city.
Apparently Ralston-Purina wanted most of the neighborhood demolished, and got its wish, but this one section of four streets was left, surrounded by public housing and interstates.
One can only imagine the bustling city destroyed by I-55 when it crashed through here. While the neighborhood had certainly declined, the well restored neighborhood proves that it was salvageable.
Update: See the interior of St. Vincent de Paul Roman Catholic Church here.
This was the oldest part of the city, and it was irrevocably erased. I almost wonder if they would have been better served demolishing all of it, instead of leaving the evidence behind of what they had done.