1. Thingvellir National Park is a UNESCO World Heritage Site located about 40km northeast of Reykjavik. It is home to Iceland’s largest natural lake, Thingvallavatn, and has a unique geological significance as it sits on the Mid-Atlantic Ridge, the boundary between the North American and Eurasian tectonic plates. This makes it a popular spot for diving and snorkeling. The park also has historical significance as the site of Iceland’s oldest existing parliament, the Althing, which was established in 930 AD. Visitors can see the remains of the parliament’s meeting place, as well as a church and several other historical buildings.

2. Thingvellir National Park is open year-round, but the visitor center has varying hours depending on the season. In the summer (May 15th - September 15th) it is open from 9am - 6pm, and in the winter (September 16th - May 14th) it is open from 10am - 4pm. The phone number for the visitor center is +354 482-2660.

3. Admission to the park is free, but there may be fees for parking and some activities. The park is about a 40-minute drive from Reykjavik, and there are several organized tours that visit the park. Visitors can also take a public bus, but schedules vary depending on the season.