Mt. Oliver

Carnegie Library of Pittsburgh collection

When Emily Eckel moved to Knoxville, a neighborhood south of downtown Pittsburgh, she was told to buy special subsidence insurance, just in case the abandoned coal mine beneath her house ever caved in. She'd never heard of it.

Megan Harris / 90.5 WESA

It was the best of times, it was the worst of times. It was the age of steel, it was the age of annexation.

On any Pittsburgh city map, there is an unlabeled stretch of land between the neighborhoods of Mt. Oliver and Knoxville.