Fine Art Photographer, Debra Achen explores the vibrant energy she experienced while visiting Stonehenge in her book, "Frequency Shift: The Stonehenge Continuum." Achen considers the source of this energy to be linked to the monument's evolving history - a story that changes over time with the prevailing thought and scientific discoveries of each era. The self-published book contains 33 photos with poetry and quotes by authors and physicists. An essay on the mystery of Stonehenge incorporates theories proposed over the centuries rooted in mythology, mysticism, astrology, even science fiction.