THINGVELLIR NATIONAL PARK

Thingvellir National Park is a must-visit place and is one of the wonders in Golden Circle with easy access by paved road and situated less than an hour driving from Reykjavik. Access is for free you just need to pay for the car park about 2$. On-site is also a souvenir shop and a bistro. The whole area is quite large so it's better to plan at least a few hours to spend there to have time explore all local sights. In the middle of the park is a church and house of parliament used in the 10-18th century. You can visit several viewing points with majestic views overlooking the lake, church, mountains, various cliffs, river streams, valley and the visible crack between two tectonic plates  (American and Europian) which are meeting right here. You can pick one of many trails leading you to different sights or explore them all.