I've visited a mall (
Newport on the Levee) in Newport, KY while my car was parked near a library (main branch of
Public Library of Cincinnati in Cincinnati, Ohio. In all, I walked about 5 miles that day, including both sides of the
Purple People Bridge (but not on the superstructure). You know, the Ohio River seems a lot bigger when you're crossing it on foot.
I've also crossed several bridges over the Scioto and Olentangy rivers on foot in the Columbus area over the years. The most interesting of those might be the the new Main Street Bridge over the Scioto, or the pedestrian bridge that crosses Olentangy River Road, State Route 315, the Olentangy River, and a bike path, just a bit south of Henderson Road.
Finally, one that's not meant for pedestrians: I've crossed the Norfolk Southern RR Dayton District bridge over Big Darby Creek once each way. I've also been on the Camp Chase Industrial RR bridge over Big Darby Creek, but I don't remember ever making it to the other side -- bees are more intimidating than usual when you can't safely run away.