Like quiet custodians of B-Boy culture, the constantly changing murals of the paint park at Castle Hill stand watch over central Austin. The site of a planned condo development in the 1980s that was abandoned, the standing concrete foundation and walls became open-sourced, publicly curated graffiti canvases. In 2011, the HOPE Campaign, with support from the property owners, was able to make the space an official arts venue and christened it the HOPE Outdoor Gallery. Artists can add to the existing work by obtaining a Paint Pass from HOPE. Spend an afternoon perusing the huge murals and “pieces,” but watch your step … there’s some admittedly dangerous footing around.