This is the Veteran's Memorial Bridge in Cleveland, one of several that traverse the Cuyahoga River and link the East and
West Sides of town. At one time there were four sets of train tracks inside the underbelly of the bridge. The trains are long gone but the space they occupied is still there.
Twice a year, the city opens the subway level of the bridge to the public and you can walk the length of the brigde, including the scary steel span over the river.
I love this town.