—Dan Cowles, Cumming
A: Ferguson, Mo., is north of St. Louis, more than 12 miles from Pruitt-Igoe, a housing development near downtown that featured 33 11-story residential buildings with 2,870 apartments. Pruitt-Igoe was completed in 1956, but "maintenance was a problem from the outset and, as a result, the buildings soon fell into disrepair," the St. Louis Post-Dispatch wrote in 2011. "The narcotics and violence that followed soon escalated to the point where entire floors served as drug dens." The first of the buildings were demolished in 1972 and the site was mostly cleared by 1976.