Sewing with Nancy did a segment on these in the WI area. It is my understanding that there is a trail to follow in a lot of states. I'm going to do some web searching.
Also, Stitchin' Heaven in Quitman, TX is a terrific store. They also do a lot of trips and one this year is to Amish coundtry inIndianaand the trail will be of QUilt ZBlock gardens. They are fantastic. Check out their website to see some pictures. I was thinking of designing one for front yard. Less grass to cut!!!