This Wisconsin Round Barn is located near New London, WI.  It is one of the best restored round barns I have found.  If you go to your favorite browser and insert "round barns Wisconsin"  you will find a summary.  They all have GPS coordinates so can be easily found.  Also listed are sites where those that were previously there but for some reason; deteriation, storms, or removal are also included.  It is amazing how many have not been kept up.  Also, near us a new round barn has been built for a daughter's wedding and now machinery is stored in it.