History and nature collide where the continents continue to drift in Þingvellir National Park, a UNESCO site within the Golden Circle. The Hakið Visitor Center is a great place to start your exploration. Inside there are interactive panels to learn about geological features and the culture of the park.
Leading from the center is a path which enters the Almannagjá fault line, with the River Öxará, or the Ax River in English, running through it.
On either side walls jut up beside you, take in the earth splitting scene as you walk in a rift valley between the North American and Eurasian tectonic plates. Trails are very well marked and you can walk from the major sights on foot or drive to the parking lots that are closest to them.
Head through the ravine to the Öxaráfoss Waterfall which is especially lovely in the early morning before the crowds.
Watching the falls tumble down 66’ in awe, but note that this was not always a peaceful place. In the Middle Ages, this was a sight for criminals to be drowned! It is also not an entirely natural place, as the Vikings moved the direction of the river to create this waterfall. The park is home to Þingvallavatn, the largest natural lake in Iceland. 
Situated between Langjokull Glacier and Mount Hengill the deepest section of this lake is 374’ and there are three species of freshwater fish. Delicious artic char, 85 million spined stickleback the most common fish, and trout that grow to the incredible size of 40 pounds! These fish were trapped in the lake during the last ice age and have evolved into different subspieces. If you are looking to get into the water, divers and snorkelers from all over the world dream of entering Silfra.
A unique experience to swim between continental plates, it is touted as one of the top 5 dive spots on earth.
The crystal-clear water has visibility over 300 feet, so even if you aren’t planning on getting wet – it’s worth the walk over to take a look at this place of divergence.
Last but not least, do not miss out on a bit of history here. In the Viking Age during the 800s, Norsemen spread to Iceland and needed to form rules and a government. Þingvellir means parliament fields and it is here where the first democratic parliament, Althing, was founded in 930. These legal and judicial concepts would shape Icelandic society.
It was at this site where the country converted to Christianity, peacefully. What could have broke out into a civil war was made into a compromise, where pagans were allowed to worship their gods in private.
Fun Fact: The park makes multiple appearances in Game of Thrones!
Good to know:
+There is a parking fee, but if you are willing to hike in you can just park outside of the signed area for free.
+Free bathroom inside the visitor center which is open 9-5PM