There is an actual natural bridge in Missouri. It is located at Haha Tonka State Park which is loaded with various examples of Karst topography.
If you look closely you can see Teresa under the bridge, which give you an example of the size of this massive structure.
The odd shaped tree trunk in the foreground is actually the base of a large grape vine.
This was taken last Monday so I converted the picture to black and white which was probably a good choice considering the limited colors in Nature right now.