Thousands celebrate summer solstice at Stonehenge

STORY: The solstice marks the longest day of the year in the Northern Hemisphere and has been celebrated for millennia at Stonehenge, a still-mysterious site built more than 4,500 years ago and apparently designed to align with movements of the sun.

Thousands gather on June 21 every year to see the sun rise directly behind the largest stone at the World Heritage site in southwest England and its first rays shine into the heart of circle.

As well as people taking in the event in person, thousands of people watched this year's event livestreamed across English Heritage's social media channels.