Discover the hengill volcanic area and travel into the lava caves of the icelandic underground on this 7 hour day trip from reykjavik you will explore a lava cave in the blfjll mountain range and take a hike around the hot spring area of reykjadalur valley where you have the option of taking a dip in the warm geothermal stream that runs through the valley enjoy this small group experience by minibus for a more personal experience