There are a lot of so-called "ghost" pictures out there. Some are caused by a trick of the light. Some are Photoshopped. And some... have no explanation. We've scoured the internet to find all the pictures of ghosts that are still a mystery.
This picture of a WWI Royal Air Force squadron appears normal at first. But if you look closely, you can see a shadowy figure behind one of the pilots. The other members of the squadron identified the figure as Freddy Jackson, an air mechanic... who had died two days earlier.
One of the world's most famous ghosts is the Brown Lady of Rayham Hall. The Brown Lady is believed to Dorothy Walpole, the sister of Great Britain's first Prime Minister. She was married to a horrible man, who locked her away from everyone, including her children, until her death.
Sightings of the Brown Lady at Rayham Hall go all the way back to 1835, but the most famous sighting resulted in this picture, taken in 1935.
This picture was taken in 1963 by Reverend K.F. Lord, who saw nothing out of the ordinary when he originally took the shot. The Spectre of Newby Church appears to be nine feet tall, with robes that resemble a monk's. Many believed that this was simply a double exposure, but after careful studying, it was revealed that this was not the case!
When he had the film developed, however, he saw the ghost people now refer to as The Watcher. Some people claim she is an aboriginal woman in traditional garb, others think she a white woman in a nightgown.
This picture was taken by Mabel Chinnery in 1959, right after visiting her mother's grave. Little did she realize that she was going to get the mother of all photobombs. Chinnery later said that seat was always her mother's favorite.
While most of the Amityville Ghost stories have proven to be a hoax, this picture has no explanation. If you look at the left side of the picture, you can see a small child staring at the camera with glowing eyes.
In 1924, two sailors died aboard the S.S. Watertown. For the days and weeks after, the crew swore that they constantly saw the two men's faces in the water. Here is a picture of one of those occurrences.
This is one of the most famous ghost photos... but also one of the most mysterious. Not much is known about it, other than it was taken in the '50s, the family in question are called "The Coopers," and they had recently moved to Texas. The hanging man is a complete mystery.
The site of the Battle of Gettysburg is home to many ghosts. This particular picture was taken at Devil's Den, by a tourist who didn't notice the soldier until after the picture had been developed. There were no re-enactors at Devil's Den that day.
According to local legend, a husband killed his wife and threw her off this bridge in Oak Grove, Kentucky. She still haunts the area, and it is said that if you stop your car on the bridge, it won't start up again.
Even more frightening? Another murder happened there in 2016.
Waverly Hills Sanatorium is considered to be the most haunted hospital in the United States. One of its most famous spirits is Mary Lee, an unwed nurse who committed suicide after getting pregnant by one of the doctors. This picture of her was taken on the night of September 10, 2006, by a paranormal researcher.
In either 1946 or 1947, Mary Andrews went and took a picture of her daughter's gravestone in the Ma Ma Creek Cemetery in Queensland, Australia. When she had the film developed, this child appeared in the photo. The child was not her deceased daughter Joyce (who was 17 when she passed), but a paranormal investigator later explored the area, and found the graves of two infants nearby. Is this a simple case of double exposure? Or an actual apparition of a child taken too soon?