Gabbro Falls is without a doubt, the best surprise falls I've been to in Michigan. There was no photo I had seen beforehand - and nothing to prepare me for this beautiful falls as it drops multiple times into a deep gorge. There are multiple short paths from the road to both the bottom of the gorge and the top, which has a better view of the falls.
Getting there: From US-2 in Bessemer, head east and take Blackjack Rd, north, following it over a wooden bridge and around a curve past a ski resort. Park on either side at the top of the curve near the old equipment and garage style buildings - the trail begins on the east side of the road.
Hike: Moderate (and steep to bottom)