Gunnuhver Hot Springs is a spectacular display of geothermal activity at the Reykjanes UNESCO Global Geopark. The closer you get along the boardwalk, the more you are awed by the thundering power of the boiling water within its 65 foot wide fissure and the giant fog of scalding, thick steam. The namesake is an 18th century woman. Locals suspected Gudrun (or Gunna) was a witch. Her ghost was accused of killing a judge and terrorizing the peninsula until tricked into falling in this cauldron.