On the way to Gdynia, I saw a small iron bridge in a Gdańsk park, and having some time before the train arrived, hiked there to get some pictures. My guess is that this is circa 1840s to 1850s, in other words, very old. I have seen a couple of early iron bridges in England, but know of no existing bridge of similar age in the US. Simply beautiful, to those who like this kind of thing (I like this kind of thing).