I had never heard of Holy Hill until I moved to Milwaukee despite the fact that I grew up in WI. It's not that it a particularly well-kept secret though, as you are sure to discover if you go there on any fall weekend boasting clear skies. It's actually a pretty well-known tourist attraction, as it is not only one of the highest points in the area,
It's probably the perfect day trip for a fall weekend. Here are a view images to show you why.
If you are in the area or if you live in the Milwaukee area and haven't gotten to Holy Hill yet, I highly recommend it! There's a lot of great, pet-friendly hiking trails, a beautiful church, and some amazing views to enjoy.