Hraunfossar
As opposed to stronger, more intimidating waterfalls like Dettifoss, Hraunfossar (Lava Waterfalls) is a series of delicately flowing rivulets over the Hallmundarhraun lava field. Located about an hour's drive north of Reykjavík, this is a great (and less crowded) alternative to the waterfalls you'll find along the Golden Circle. Don't miss the nearby Barnafoss, another waterfall, which is located a quick walk down the Hvitá River.