Fellow pedaling photographer Luke Seemann found a great archive of historic color photographs of Chicago’s Loop and near south, west, and north sides, dating from 1938-1968, then traveled to see what’s there now. The results, especially in the “renewed” south and west sides, are astonishing.

The Boston Globe’s Sunday magazine runs (ran?) a weekly feature of just this sort of “then and now” photos; somehow, it’s more understandable that a city would disappear and reappear over the course of two hundred years. But just forty years?