A tourist attraction.
Build a bridge-crossing ride on the side of existing bridges with a nice view (hills, rivers, etc.) You get into a transparent pod and ride to the opposite side of the bridge.
A view from a bridge- all around the world 🙂
Have webcams set up by volunteer representatives (in return for exposure online) all around the world, so anyone can see what’s going on any place where there are pedestrian bridges, the view, as well as get their pictures taken with the background view showing. The software detects when someone is looking into the webcam and smiling, and then it takes their photo and automatically publishes it on an online wall of photos like it from all over the world.