Yogies and yoginis celebrate this day with sun salutations, while new-agers and "druids" celebrate at Stonehenge in England.

I always turn to my friend Teresa O'Connor, author of the blog Seasonal Wisdom, for the wonderful folklore surrounding the holidays and seasons, and she never fails me.

In her post on the Summer Solstice, Teresa writes that in ancient times, it was actually considered mid-summer, not the beginning of summer, and the night before was fearful because fairies and evil spirits would be about.

Folks used to build giant bonfires and bring family, friends and animals close to protect them. But some anxieties were real -- this time of year ushered in a season in which crops, humans and livestock were most vulnerable to disease and insect damage.

For more about the Summer Solstice, and other seasons of the sun and moon, check out Teresa's blog.