The abandoned Wilde Yarn Mill, at the time of its closure the oldest operating yarn mill in the US. The building has now been renovated into condos Gallery: https://www.abandonedamerica.us/wilde-yarn-mill
Built in 1884, the Wilde Yarn mill in Manyunk, PA was listed as the oldest continually operating carpet yarn mill in America at the time of its closing in 2008. When I photographed it in 2012, I was unaware how quickly it would change.
