Join a six-and-a-half-hour tour that exposes you to Icelandic history as well as its geological phenomena, among the most unusual in the world. Begin at Thingvellir National Park, where Iceland's Parliament, or Althing, was established in 930, making it the world's oldest ruling body. Here it remained until 1798, when the government was moved to Reykjavik. Thingvellir National Park, a UNESCO World Heritage site, was founded in 1930, marking the 1,000th anniversary of the Althing. Thingvellir is also a primary geological site, as here the tectonic plates of North America and Eurasia split, and visitors can actually see the rift between them. Once you have viewed the top of Thingvellir, the tour continues to visit Gullfoss, the waterfall that is an astonishing 600 feet wide. Then, it's on to the world-famous Geysir, considered by many the most intriguing natural phenomenon in a nation that is known for its other-worldly topography. On the return trip, you'll pass Hveragerdi village, where geothermal water has been used to build an extensive greenhouse industry, demonstrating once again that Icelanders are global pioneers in the use of this form of energy.