Here's one thing to do with all the abandoned buildings in Detroit: turn them into urban ski slopes.
"Tracing Skylines," a movie by Poor Boyz Productions and Red Bull Media House, features skiers taking on the terrain in Alaska, Canada, Switzerland, France and, naturally, Detroit. Karl Fostvedt skis in an abandoned church, factory and school in and around the Motor City.
Though the crew seems to be less than knowledgable about Detroit, where residents are reasonably going to be a little suspicious when you turn their city into a snowy playground, they definitely have the skiing down. You've never seen winter sports quite like this:
This should be obvious, but please don't try this at home.