Iceland's Golden Circle

View of Þingvellir, the site of Iceland's parliament from the 10th to 18th centuries

View of steam at Geysir

View of Litli at Geysir

Strokkur erupting at Geysir, it erupts every 8-10 minutes on average

Strokkur erupting at Geysir with tourists watching

View of glacier from parking lot at Gullfoss waterfall

Gullfoss waterfall at a distance

Gullfoss waterfall with mist

Water close up at Gullfoss waterfall

Langjokull Glacier and mountains

Langjokull Glacier in the fog

Dark cloud view from Langjokull Glacier

Impression

Iceland's Golden Circle is a very popular tourist loop which mainly consists of Þingvellir National Park, the Geysir Geothermal Area, and Gullfoss waterfall. Additionally, it can include the Langjokull Glacier and Kerið Crater.

Þingvellir is a historical landmark which also has geological significance, it was the meeting place for Iceland's parliament and is also the boundary between the North American and Eurasian tectonic plates.

There are various tours that will take you to these locations from Reykjavík. Alternatively, you can drive yourself to all of these locations in a single day.

I found the Gullfoss waterfall and erupting geyser at Geysir to be the most impressive for me personally. Getting to Langjokull Glacier is a bit more challenging, requiring driving on a dirt road.