Twenty-six countriesreported approximately 10,000 crop circles in the last third of the 20th century; 90% of those were located in Southern England. Circles in the United Kingdom are not spread randomly across the landscape, but they appear near roads, areas of medium to dense population, and cultural heritage monuments, such as Stonehenge or Avebury.
Since becoming the focus of widespread media attention in the 1980s, crop circles have become the subject of speculation by various paranormal, ufological, and anomalistic investigators ranging from proposals that they were created by bizarre meteorological phenomena to messages from extraterrestrial beings.Many crop circles have been found near ancient sites such as Stonehenge, a prehistoric monument located in the English county of Wiltshire. They have also been found near mounds of earth and stones raised over a grave or graves, also known as tumuli barrows, or barrows and chalk horses, or trenches dug and filled with rubble made from brighter material than the natural bedrock, often chalk. There has also been speculation that crop circles have a relation to ley lines. Many New Age groups incorporate crop circles into their belief systems.
A 17th-century English woodcut called the Mowing-Devil depicts the devil with a scythe mowing (cutting) a circular design in a field of oats. The pamphlet containing the image states that the farmer, disgusted at the wage his mower was demanding for his work, insisted that he would rather have "the devil himself" perform the task.
