According to a Dec. 31 article on Weather.com, a mysterious crop circle has appeared in a field in Salinas, Calif. There has been no indication of its origin, whether made by aliens or humans. Salinas residents are described as being “baffled and amazed.” It appeared on Dec. 30, and you can view aerial photographs here.
Carved in a barley field east of Salinas, this intricate design has drawn a lot of attention. Salinas is an agricultural center due to its mild climate, and the city is known as the "Salad Bowl of the World," providing over 30% of the world's lettuce. You can read more about the Salinas area on Wikipedia.
The owners of the field have actually hired security guards to protect the crop circle which takes up around an acre of ground.