A UFO has been spotted over a historic barn in the skies of California this month, sparking a wave of interest from bewildered locals as to what the object could be.

On May 7, a woman, Ellen Henry was taking photos of the historic Edgemoor Barn in Santee, California. Ellen is a member of the Santee Historical Society (SHS) located in San Diego County.

However, as she took one photo she noticed on the image that she had took that there was a clear, but mysterious, object in the sky above. She had not seen the object at the time of taking the photo but was stunned when she saw it on the screen on her camera.

Henry has told ABC TV affiliate News 10, "It was clear and certainly not a bug."

She has described the incident, "I was at the Edgemoor property, in the middle of the day, to take pics of the barn to update the SHS barn logo. I was constantly looking up and around the area, including the sky's background, so I can get it just right, and not at anytime did I see anything in the sky or heard a sound of an aircraft."

Henry added, "I noticed a 'speck' on my LCD screen after I took the shot to check for clarity, and only realized it wasn't a speck when I downloaded it on my computer."

The News 10 report has also spoken to nearby airfields that send aircraft out into the flight paths around the barn, but they had confirmed the object would not have been any aircraft from them.

The report stated: "The barn sits under several flight paths. We called Gillespie Field and MCAS Miramar (Marine Corps Air Station), but neither could offer an explanation."

Henry herself also added, "There is no way this was a commercial aircraft. I would have heard it, especially as low as it seemed to be. Someone did mention perhaps it was a drone. However, I have not seen any drones that were round or oval, and lacking wings, rudders or propellers -- even the drone that looks like a fly has wings."