The space beneath a city bridge can be a dumping ground and a magnet for crime and sketchy characters. The area under the Kingshighway Bridge in St. Louis was like that. But skateboarders Zac DelCortivo and Kyle Crandall saw opportunity there. They held fundraisers -- a concert, an art show and more -- to pay for materials...and started building a monster DIY skate park.The story, sadly, isn't online -- but you can find the magazine on newsstands now. Other Hometown Heroes showing us slackers ways to change the world are Seattleites who opened a tool library, a Wisconsin dude who repairs old bikes and donates them to the needy and Jordan Grant of Columbia, Missouri, a National Guard member who served in Iraq and now builds computers and gives them away to people too poor to afford one.