Detroit's Packard Plant is a massive complex of industrial buildings that have become an icon for the failing automotive industry. The plant has long been abandoned; Packard closed its doors in the 1950s, and the site has been left largely forgotten ever since. You can see several great sets of black and white photos of the Packard Plant at Silent Buildings.
As with so many abandoned buildings in Detroit, it has been victim to much vandalism and arson. A June 2010 fire at the Packard Plant burned for about a week; there are unstable tunnels running below the plant, so bringing fire trucks into the complex is too risky. See photos from the fire here.