Then correct answer is Stonehenge may have served as an Observatory or Auditorium, to calculate seasons and eclipses accurately.
One of the most recognized theories states that Stonehenge may have served as an Observatory to mark summer or the Winter solstice, as well as an auditorium for the study of astrology where its huge stone pillars were used by the ancestors to predict eclipses.
Stonehenge is located in Wiltshire, England, west of Amesbury. It is a big megalithic ring complex on a landscape with standing stones with thirty pillars weighing 30 tons. It is considered an important monument of the Bronze Age.