Nice scenery is sometimes considered a public good. States occasionally seize on that argument to prevent development of private goods that would disrupt the scenic view.

Another physical one, that builds off your initial argument about the roads (When are they going to finish those damn roads anyway?) is paths or trails. Unlike roads, paths and trails are often formed by repeated use of particular routes, rather than being constructed by a particular person or entity. They were essentially homesteaded by the members of the community that formed them and as such are owned in common by the public. As long as traffic remains at a stable level below congestion, they are also functionally non-rival in their use.