Summer festival of the White Brotherhood
On 19 August this year the White Brotherhood is gathering at the Seven Rila Lakes (as they do each year) to meet the sunrise with a holy dance.
They are followers of the movement, founded by Bulgarian Petar Deunov, a synthesis of Christianity and Hinduism with a heavy emphasis on brotherly love, a healthy diet and living in harmony with nature.
Thousands of people participate, the dance and religious songs accompanied by violins.
The Daily Mail published an interesting piece about the event some years ago. Worth watching the videos it contains.