For all those cave curious travellers, Iceland having quite a collection of diverse caves, might be the perfect place to go. Here is a photograph of the entrance to the biggest one of those caves, Víðgelmir. Situated in the Hallmundarhraun lava field (West Iceland), Víðgelmir is a 1585 meter long lava tube. An expedition to the cave is interesting both for historical input as well as geographical. Traces of human habitation, most likely from the Viking Age have been found in Víðgelmir.