Þingvellir is a national park in Iceland, known for its stunning landscapes and geological significance. It is located in a rift valley between the North American and Eurasian tectonic plates, making it a unique site for observing continental drift. The park is also home to the largest natural lake in Iceland, Þingvallavatn, which supports diverse wildlife. Historically, Þingvellir is significant as the site of the Althing, one of the world's oldest parliaments, established in 930 AD. This gathering place was crucial for Icelandic governance and law-making for centuries. Today, Þingvellir is a UNESCO World Heritage Site, attracting visitors for both its natural beauty and historical importance.