Approximately 20,000 people descended upon Stonehenge in the early hours of Sunday morning to mark the summer solstice at the ancient Wiltshire monument. The crowd assembled around the prehistoric site's heel stone, which serves as the entrance to the structure, to observe the sunrise at 4.52am on what is the longest day of the year in Britain. The astronomical solstice itself was due to take place at 9.24am, when the Earth's axis reaches its maximum tilt towards the sun. The neolithic monument