Barnafoss, the waterfall of the children, comes from an accident which is said to have taken place here in former times.
There was a natural bridge over the waterfall and two children from a nearby farm fell to their deaths crossing the river on the bridge. Afterwards, the bridge was destroyed.
Víðgelmir is a lava tube or a cave situated in the Hallmundarhraun lava field (formed around 900 CE). The roof of the lava tube has collapsed, creating two large openings near its north end which are the only known entrances. Víðgelmir is 1585m long and the largest part of the cave passage is 15.8m high and 16.5m wide, making it by far the largest of its kind in Iceland. The cave has a wide entrance but narrows down in some places. An iron gate was installed at the first constriction in 1991 to preserve those of the delicate lava formations or speleothems which haven’t already been destroyed. Evidence of human habitation, probably dating to the Viking Age, has been discovered in the cave and is preserved in the National Museum of Iceland.