Across the United States, once-booming industrial towns are now barely surviving, their streets and tax bases hollowed out by factory closures, population loss, and disinvestment. These 15 communities ...

Fossilized footprints, preserved in gypsum mud that hardened over time, are estimated to be 23,000-21,000 years old. NPS / Alamy Ancient human footprints, preserved in a dry lakebed at White Sands ...