Þingvellir (Thingvellir) is a historical site and national park in Iceland, just east of Reykjavík. It's known as the site of Iceland's parliament from the 10th to 18th centuries. In the park, you can find the Þingvellir Church and the ruins of old stone shelters. The park itself sits in a rift valley caused by the separation of 2 tectonic plates, with rocky cliffs and fissures like the huge Almannagjá fault.