The prehistoric site of Stonehenge in Wiltshire, has been a place of worship and celebration at the time of the summer solstice for thousands of years. The solstice (which means a stopping or standing still of the sun), is when the sun is directly above the northern hemisphere, indicating midsummer. The summer solstice has been celebrated by everyone from ancient druids performing rituals at stone circles, to new age, neo-Pagan, hippie revelers and modern-day scientists. Held within the vicinity of Stonehenge, this increasingly popular annual four day mini-festival is the one and only camping and live music event within the vicinity of the world heritage site, and a rare chance for members of the public to walk among the ancient stone circle. By sunset, a few thousand people have usually congregated to keep vigil. By sunrise, numbers have invariably swelled to more than 20,000 people ready to greet the sunrise.