O Thingvellir National Park is one of the rare sites classified as UNESCO heritage in Iceland; and this fact, by itself, well testifies to the historical importance of the place. The park is located in the heart of the Golden Circle, the most ISLANDIA.
Thingvellir has the particularity of mixing a very important historical significance with geological importance and magnificent landscapes.
First of all, Thingvellir symbolizes Icelandic national identity. It was there that the Parliament of Iceland was founded in 930 AD and the parliament remained in operation at Thingvellir continuously until 1798, when it was transferred to Reykjavík. It is no wonder, then, that the proclamation of the Republic of Iceland also took place in Thingvellir. It's a symbolic place.
But that's not all.
Geologically speaking, it is one of the rare places on the planet where you can walk between the American and European continents. This is because Thingvellir National Park is located between the tectonic plates of North America and Eurasia, in a valley surrounded by mountains and volcanic mountain ranges.
In addition, the park includes traces of agricultural use from the 18th and 19th centuries and "shows evidence of how the landscape has been cultivated for more than a thousand years" - the words are from UNESCO.
There are many reasons to visit Thingvellir, the first place of great importance to emerge on the horizon for those who venture Golden Circle of Iceland.
See also my Campsite search in Iceland.
More photos of Thingvellir National Park
If you are traveling by rental car, please know that the parking lot of Thingvellir National Park is paid (I paid 1.000 ISK to park the motorhome). For more information see the website park official, accessible in www.thingvellir.is.
Where to stay
In Reykjavik, I had the privilege of staying in one of the best hotels in the city, called Canopy by Hilton Reykjavik City Center, and I only have compliments to do. If the budget allows, it is an experience that I strongly advise. Otherwise, consider staying in the cheapest (note I did not write cheap!) Our House Guesthouse, Grettir Guesthouse ou Heida's Home. To save even more, watch the Reykjavik City Hostel, an excellent hostel further away from the center.
On the remaining nights, if you do not want to go back to Reykjavík and Golden circle, consider the welcoming (and relatively inexpensive) Skyggnir Bed and Breakfast. Continuing south, be sure to stay in the Hrifunes Guesthouse following days. It is a very welcoming hostel where you will feel at home, with friendly hosts and delicious (and creative) food.
A World Nomads offers one of the best and most complete travel insurance recommended by National Geographic and Lonely Planet. Other excellent and cheaper option is IATI Seguros, which has no age limit and allows multivariate insurance (including long-term travel) to any destination in the world. It's the insurance I use in my travels.