What may be the oldest parking garage in America once helped modernize Downtown Knoxville. Now, the crumbling brick structure faces an uncertain future. Reporter’s note: Though many of these buildings are unused and empty, they sit on private property that is still actively used in some cases. Do NOT attempt to unlawfully enter any of these places without permission. Many of them are structurally unsound and pose potential health hazards, like asbestos and lead paint. 10News contacted all owners and obtained permission prior to visiting.