Add a little adventure to your golden circle tour with this small group caving adventure along with the most beautiful sights in the golden circle route visit a lava tube located in the beautiful national park ingvellir a park of both historical and geological importance this tour continues to the geyser geothermal area where you will see the geyser strokkur blow out water every 4 8 minutes followed by the gullfoss waterfall only 10 minutes away the most powerful waterfall in iceland maxi