Fifty shades of green: the Grábrók Crater.
About 110 kilometres north of Reykjavik you will find the remains of three active volcanoes: the Grábrók crater.
This crater remains after a volcanic eruption of approximately 3000 years (!!) ago.
The crater can be found when you follow ring road 1 towards the north.
Volcanoes are dangerous, we all know that, but volcanoes are also known to extinguish, and can “sleep” for years, some really extinguish, and it is expected that these will no longer become active.