I was at Avebury (Standing stones about 30 miles from Stone henge) last Midsummer's Eve and when the sun rose on Midsummer Day, there was a crop circle formed in a nearby field. There were about 200 people there that night and no one saw any human involvement. Many cars had battery failure indicating some electromagnetic interference.
I dont know - I'm a cynical ICU nurse, but I went and stood in that crop circle and got the most amazing feeling of bubbling energy inside me. After being up all night too!