Henge
A Henge is a primitive construction of large standing objects. The term is generalized from the suffix of Stonehenge, and probably refers to the similarity of the stones to the gallows or gibbets therefore "Hanging Stones". The word "Henge" now has a much wider meaning. Generally reckoned to apply to constructions of the Neolithic period, henges are usually, but not always, roughly circular areas surrounded by a bank and ditch. Often they may contain standing stones or show evidence of wooden structures, some may have burial sites.One of the finest in S. England is Avebury Henge, about 20 miles N. of Stonehenge.
Henges seem generally to have been used for rituals, or astronomical observation rather than permanent dwelling areas.
Most authorities agree that they are solar declinometers used to measure the position of the rising or setting sun. Authorities are confident that they could be used to synchronize a calendar to the solar cycle for purposes of planting crops or timing religious rituals. Most henges have poles, stones or ditches that would indicate the position of the rising or setting sun during the equinoxes and solstices. Additionally, many are placed so that nearby hills either mark or do not interfere with such observations. Finally, many henges appear to be placed at particular latitudes. For example, a number are placed at a latitude of 55 degrees north, where the same two markers can indicate the rising and setting sun for both the spring and fall equinoxes.
The apocryphal Book of Enoch appears to give detailed instructions on how to construct a paleolithic henge, and use it to manage a calendar.
Carhenge is either a modern parody or artistic tribute to the famous Stonehenge structure.