Þingvellir (Thingvellir) National Park is one of those places that you must go to if in Iceland for good reason. It is historically significant as the place where the original Iceland government met, and it is amazing and beautiful site to see. It is also geologically fascinating because it sits where two major tectonic plates are spreading apart. Also, if you watch Game of Thrones, you will evidently recognize it. The very tall rock wall you can walk along side is known as Almannagjá, and it is just one of things you need to do in person to really grasp the awe of it. I found this to be a good source of information on the geology of the area.
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