Travel back in time to Buffalo, 1979.
The mural celebrating printmaker Dox Thrash is now a big, ugly square of paint.
Where property abandonment is growing and declining.
Penn Hills, Pennsylvania's foreclosure woes have left it in deep trouble. At least two entrepreneurs are cashing in.
"People just want to live for a day in a zombie apocalypse," explains Mark Siwak, the braaaaains behind Z World Detroit.
An Italian website compiles crowd wisdom and ideas to utilize vacant properties.