In a photo from May 16, 2013 at Crosman School in Detroit, water pools on the warped tile of what was once a basketball court. No one knows how long the water has flowed through the moldy bowels of the massive building a few miles north of downtown, but Crosman has been closed since 2007. It’s not the only empty structure where city water steadily fills dark basements or runs into the gutter, wasting money and creating safety hazards. (AP Photo/Carlos Osorio)