Myvatn, Iceland: Dimmuborgir

There has been all sorts of volcanic activity around Lake Myvatn over the years, and that means lava. And when lava is around, interesting rock formations often follow.

In this case, some volcanic eruptions about 2,000 years ago - before people turned up in Iceland - led to the creation of the shapes shown here. Some lava solidified more than others, leading to an irregular surface.

A trail winds its way through the "park," if that's the right word. It takes perhaps 45 minutes to see it, and the road is paved so the walking is interesting.

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