These are a few of the bridges from a server I run. There are only 2 of us on there full time, we resource materials in vanilla mode so its a long slow journey.
As we have no portals, the road and bridge system is a key part of the world so we do tend to build a lot of bridges. Non e are massive, majestic works. All bridges you can build in 'Bronze Age' game progression.
These are no dev commands and no fly/creative mode builds.