Háifoss Waterfall, located in Iceland's stunning Þjórsárdalur Valley, is one of the most beautiful waterfalls in Iceland. Accessible only in the summer, there's a rough gravel road leading to it. It can be done with 2wd but there're some big stones and large potholes so you would need to drive very carefully. 4x4 recommended.

You can either see the waterfall from the top or take a 30-60 min hike to the bottom of the valley where you can walk all the way to the bottom of the waterfall. A lot of water spray there so bring your rain gear and good hiking shoes!