http://www.pbs.org/wgbh/nova/insidenova/2010/01/stonehenge-cemetry.html

Every summer, they descend on Stonehenge by the thousands to watch the sun rise on the longest day of the year -Pagans, Druids, party animals, foreign exchange students, families with kids, documentary producers. Some dance, drum or dream the night away; others sip or smoke all manner of mind-altering substances. When dawn arrives obscured by clouds (or sheets of rain, like the year I tried to attend), no one seems to mind. The vibe is festive and life affirming. I wonder how many revelers realize they've just boogied down on a sacred burial ground.