There are hundreds of powerful waterfalls to be seen in Iceland, but you can only get to Gylmur, the country’s second highest waterfall, by foot.
The start of the trail is about an hour north from Reykjavik, at the far end of Hvalfjörður (The Whale fjord). Both the drive to the trailhead and the hike up to the waterfall are truly enchanting. The hike itself is about three to four hours (the roundtrip), and is full of mossy green canyons, caves, wildflowers, bubbling streams, and endless vistas. You will not be disappointed.