The National Register is a federal list of districts, sites, buildings, structures and objects that are significant in American History.
On July 22, 2020, the City of Monona in conjunction with the Wisconsin State Historical Society hosted a virtual educational session on National Register nomination. This event outlined what National Register status means and the potential benefits of nomination.
You can watch a video recording of the meeting here: https://www.youtube.com/watch?v=RwAeCW0iA-U
Wisconsin Historical Society Presentation
Below is the Power Point presentation from the meeting, which further explains the nomination criteria.

Other Resources
The Wisconsin Historical Society has lots of information about Wisconsin's history and landmark places.
The National Parks Service oversees the National Register of Historic Places. Their website provides more information about the Register and a catalog of all currently registered places.