Druids and pagans are expected to be among thousands of people travelling to Stonehenge this morning to witness the sunrise on the shortest day of the year.
Last year, hundreds dressed in medieval clothing to celebrate the solstice, which marks the latest dawn and the point when the sun is at its lowest point in the sky.
The sun will rise over Stonehenge in Wiltshire at 8.04am this morning and English Heritage, which looks after the prehistoric monument, says it expects 5,000 people to attend the celebrations.
Heavy metal star Ozzy Osbourne and his son Jack have been out filming in the West Country. The reality TV star Tweeted about his visit to the ancient monument. It is believed the pair are making a TV series in the region but they have not said exactly what is involved.
Jack described the day as "getting our history lesson on".
The Osbournes were also spotted filming on Portland - they dropped into a local stone company while they were there.
Ohhhh just hanging at #stonehenge getting our history lesson on. @ozzyosbourne
Today marks a hundred years since Stonehenge was bought by a Wiltshire landowner, which led to the ancient monument being saved for the nation.
Cecil Chubb later handed the land to the Ministry of Works - the forerunner to English Heritage - which will be celebrating the anniversary.
Stonehenge has been rated one of the 500 best places to visit in the world.
Travel guide Lonely Planet has put Wiltshire's towering ancient monument at number 62. The number one spot was taken by the temples of Angkor in Cambodia.
The Ultimate Travelist is being published today, and has a reputation as a dream to-do list for many travellers.
Around thirty thousand people are making their way to Stonehenge this evening to celebrate the annual summer solstice.
One of the largest numbers of people will be gathering overnight due to good weather and the event falling on the weekend.
Police are asking visitors to enjoy themselves - within the law.
The officer in charge, Supt Gavin Williams says his approach will be open and friendly - but robust - in the face of any troublemakers.
Ahead of the Summer Solstice the National Trust reported that their campsite at Avebury was full within the first 30 minutes of being open this morning.
The Trust are now warning people to arrange their accommodation before setting off for Avebury.
If anybody is still thinking of heading for Avebury today or tomorrow, the National Trust would appeal for them to use public transport.
The National Trust has a small area of land which can be used for camping but it only allows for a little under 100 tents – the same area as was used in previous years. Because Avebury is a World Heritage Site and an important archaeological site, options are very limited.
There's a warning of very slow traffic on the A303 in Wiltshire between A360 (Longbarrow roundabout) and A345 Countess Road (Countess Roundabout).
The situation has not been helped by an accident at 7pm involving five cars that blocked the eastbound side for a time.
A new exhibition opens today at the Stonehenge visitor centre looking back at the history of the site as a tourist attraction.
Objects on display include the oldest Stonehenge guide book from 1823, early 20th Century tickets, and souvenirs from over the years.
The exhibition will run until March.
A group of historians has been meeting at Stonehenge to protest against proposals to widen the road next to it.
Millions of pounds are due to be spent to upgrade the A303.
Historian Dan Snow has been speaking to ITV news.