Any true crime fan loves an unsolved mystery. Here are five of history’s most morbidly fascinating mysteries or murder and mayhem that remain unsolved to this day.

1. The Mysterious Amputee of Sandy Cove

On September 8, 1863, a horrific discovery was made on the beach of Sandy Cove in Nova Scotia. A man was found with both legs amputated that were poorly bound and partially healed. Beside him was a jug of water, a tin of biscuits, and nothing more. What had happened to the man? We still have no idea. The locals who found him attempted to speak with him, even bringing in sailors of different nationalities to see if he would speak their language, but he said nothing aside from mumbling something that sounded like “Jerome.” Taking that for his name, many tried to discover Jerome’s real identity with no luck. It has been speculated that his amputation was a punishment for attempting a mutiny on a ship, and he was then left behind in the cove to fend for himself. Others believed that he was heir to a fortune and left on the shore by someone hoping to get his inheritance. But with Jerome not able (or willing) to speak about whatever harrowing experience left him legless and abandoned, he took his mysterious past with him when he died almost 49 years later!

2. The Charfield Railway Children

In October 1928, a train carrying 60 passengers crashed in a thick fog. Sixteen passengers died in the crash, including two young children — a young boy and girl burned so badly that they couldn’t be identified. No one ever came forward to claim the children, which was strange enough, but after a memorial was built for the victims of the crash, it got even stranger. Locals say that every year on the anniversary of the crash, a mysterious woman wearing a long, black robe visited the children’s graves, leaving behind flowers. She visited every year until the early 1960s. When a member of the media tried to approach her on the anniversary, she ran off and hasn’t been back since. The identity of the two children remains a mystery to this day.

3. The Toledo Clubber

In the 1920s, like many places in early industrial America, Toledo, Ohio, was a scary place to live. Crime, gang fights, and fires were commonplace. At the center of all of the turmoil was one man nicknamed the Toledo Clubber. Police believed he started with fires and bombings, turning to murder once he realized investigators started looking into his crimes. And so began a series of horrific attacks. In just one week in November, at least nine women were raped by the unknown man, clubbed with a heavy object, and left for dead. Almost a year later, another two Toledo women were attacked within hours of each other. And shortly after, a Toledo lumberyard and several buildings were set on fire. Finally, just as suddenly as the crimes began, they came to an end. Tips came in about the identity of a man, and a suspect (a convicted grave robber) was even questioned, but nothing led to an arrest. Over 100 years later, the identity of the Toledo Clubber remains a mystery.

4. The Green Children of Woolpit

Leprechauns? Martians? Children of the Incredible Hulk? Or something else? How does one explain the Green Children of Woolpit?

In the mid-12th century, in the Woolpit village of Suffolk, two young children allegedly emerged from a pit used for trapping wolves in the area. Their skin had a green tint, they were dressed in strange clothing made from a fabric no one recognized, and they spoke a language no one had ever heard before. When a local landowner first took the bizarre pair, they wouldn’t eat anything besides green beans still in their pods and continued to speak only in their mysterious language. The boy didn’t adapt as easily as the girl: he became depressed and ill, eventually passing away. The girl, meanwhile, had picked up enough English to try to explain what happened to them. The tale she told was chilling — she said the boy was her brother, and they came from an underground land full of fellow green people. When they were out herding cattle one day, they fell into a large, pitch-black pit. Eventually, a flash of light appeared, and they followed it, only to emerge from the wolf trap in Woolpit. To this day, no one knows for sure who the children were or where they came from.

5. Jean Spangler

Jean Spangler was an actress during Hollywood’s Golden Age. She seemed destined for stardom until she just vanished! It was 1949 when Jean Spangler was supposed to meet her ex-husband to discuss child support, but she never showed up. And, according to her ex, she was never seen again. The only thing they ever found was her purse, with a strange note inside that read, “Kirk, Can’t wait any longer. Going to see Dr. Scott. It will work best this way while mother is away.” She did know a Kirk. Kirk Douglas. They had worked together on a recent film, but Douglas went out of his way to make sure to tell people he barely knew her. Another lead took investigators to an abortion doctor named Dr. Kirk, who had been recently threatening his former patients. However, every lead and possible explanation led to a dead end, and no trace of Spangler has ever been found.