Þingvellir is a place in south-west Iceland, near the peninsula of Reykjanes, and the volcanic area Hengill, and is mostly situated on lava fields. Þingvellir is very popular with tourists, and has a particular historic, cultural, and geological meaning for Iceland. It is even referred to as the national sanctuary of Iceland. The place is famous as a Thing site - a place of people's and court assemblies - which makes it one of the most important sites of Icelandic history. Furthermore, because of its special tectonic and volcanic environment, Þingvellir was declared a national park in 1928.