This is a photo of the Charles Bridge, spanning the Vltava River in the city of Prague. One of the loveliest Medieval bridges still extant, it was finished in 1402. There is a really neat animation that in three minutes shows how the bridge was built (it actually took 45 years IRL). Unfortunately Instagram won’t let me put a link to it from this post, but the address is: https://youtu.be/nJgD6gyi0Wk
It’s an easy search with “video animation of medieval bridge construction Charles Bridge” too.