Holy Hill Basilica and National Shrine of Mary Help of Christians, or just Holy Hill as it is commonly known, is a Roman Catholic shrine and basilica located northwest of Milwaukee, WI. Holy Hill attracts 300,000 visitors, many of whom visit during the fall. Since Holy Hill is located on a glacial kame that is one of the highest points in southeastern Wisconsin, the views of the fall colors can be quite spectacular. Visitors can climb the 178-step observation tower to get better views and during peak weekends, the line to climb to the top can be more than an hour.