Thousands of revelers have gathered at Stonehenge to watch the sun rise and celebrate the summer solstice.

Some 12,000 people gathered at the stone circle to dance and do yoga on the longest day of the year in the northern hemisphere Tuesday. The crowds were somewhat smaller than the 25,000 expected to see the sunrise at 4:52 a.m. (0352 GMT; 11:52 p.m. EDT Monday).

Wiltshire Police say events were "positive and peaceful." Alcohol, drugs, pets and sleeping bags were not allowed near the monument.

The stone circle in southern England, believed 4,500 years old, is a World Heritage site known for its alignment with the movements of the sun. Thousands visit to mark the solstices in summer and winter.