Green and Lush
Green and lush is not what you are expecting in Iceland. Especially when they tell you it is the valley between the American and European teutonic plates. But once you are there, the scenery is beautiful. There are great rocks hoisted out of the ground. They just look powerful. And helps you to understand why for thousands of years, this majesty was the meeting point of the islands clansmen for governing. But then you can look out, and see this huge lake, with geothermal plant exhaust steams in the horizon; that give the sense of mysticisim. And then you walk down into the actual valley between continents (the only place above the ocean floor), and realize how large those rock walls are, and how you feel you are at the bottom of the world.
I went as part of a tour, and we got rushed through a little faster than I would have liked; but then we covered a lot of ground that day. Our tour continued to glacier snowmobiling - which was fantastic! (I highly recommend it as well.)