So why were there Rogation Shrines? Processions were held on the three days prior to Ascension Thursday. Priests led processions round the fields, blessing crops and praying for good harvests. A secondary purpose was to bless the main boundary markers of each parish, in towns as well as rural areas. A cross, relics, hand-bells, and banners were carried; those taking part were sometimes given a communal meal supplied from church funds, or received food at the houses they passed.
Here is Wisconsin where the Belgium people settled. They brought their faith and in the area I lived there were once many shrines like this in the farm areas. Here is one that has survived all those years.
44° 24.854′ N, 87° 41.038′ W. Marker is near Stangelville, Wisconsin, in Kewaunee County. Marker is at the intersection of County Highway AB and Pine Grove Road (Road R7), on the right when traveling north on County Highway AB. Marker is 1 mile north of Stangelville, or approximately 9 driving miles south of Luxemburg.