Tunnel Falls is a must-see spot on the Eagle Creek Trail near Portland, Oregon. This majestic waterfall plunges 160 feet from towering cliffs into a rushing creek below. The coolest part? You can actually walk behind the falls through a tunnel blasted into the rock. It's like stepping into a hidden grotto filled with ferns and wildflowers. Just be careful not to venture off-trail or mess with nature's erosion plans. And if you have time, check out nearby Twister Falls for an extra dose of waterfall magic. Just be aware, this hike is 13 miles round trip.