What is it about unsolved mysteries that captures our curiosity so completely? I can’t say, but given all of the television shows, movies, articles, and other media with huge ratings success that delves into these cases (Making a Murderer, anyone?), there’s no denying there’s something there.

Below are 4 that are especially creepy, and it’s not helping matters that no one seems to have the slightest clue how to solve them. Or even where to start.

4. The Lead Masks Case

In 1966, a Brazilian boy who was innocently (so he claims) flying a kite stumbled upon the bodies of two engineers on the side of a hill. It was impossible to tell by looking at them what happened (and I assume the cops dismissed the boy as a suspect). They were dressed immaculately and – very strangely – wore lead masks designed for protection against radiation.

Photo Credit: Reddit

The case got stranger as the police dug up details about the men, who were electronic technicians, and what they did before climbing that hill. They bought raincoats and then went into a bar to buy a bottle of water (which was found at the scene). In the bar, one of them was reportedly very nervous.

That’s it.

Oh, except for a notebook that was also found with the bodies, and here’s where things get really weird. It contained a note that translates to:

“16:30 be at the agreed place. 18:30 swallow capsules, after effect protect metals wait for the mask sign”

Not much of that makes sense, but if they took capsules, perhaps it added up to nothing more than a planned double suicide, right?

Maybe. Maybe not.

For one, the scribbled note talks about what they’re planning to do after they take the capsules, right? And not only that, but they had a coupon to return the water bottle later that day. Sadly, a lack of preservation rendered toxicology reports unavailable, which means we’re left with far more questions than answers.

Why were they taking capsules in the first place? What was the radiation gear for? Did they think something was going to happen? What metals needed to be protected? Perhaps most curious of all…what killed them?

It’s a mystery that seems determined to go down in the history books unsolved.

3. The BC Feet Mystery

Yeah, you read that right.

Over the course of the last few years, EIGHT disembodied feet have washed up on the shores of British Columbia. The severed feet have all been attached to running shoes which, according to experts in these sorts of macabre things, makes sense. Our ankle joints are relatively weak, so a body thrown in the water would naturally, um, break apart there. Add a pair of floaty soles, and there you go.

Photo Credit: The Spec

Only two of the feet are a matching pair, and they belong to a man who police claim was a suicide risk. But all four (or more?) victims can’t have killed themselves in the water while wearing tennis shoes…right?

I mean, I guess it’s possible, but it doesn’t seem very likely.

There are other theories as well. One is that the people were all involved in a boat or plane accident, but the fact that they were found carried by different currents seems to render that one unlikely, too. Most people seem to think it’s the work of a serial killer (and I do, too), but as of now, there are no suspects.

2. The Monster With 21 Faces

It all began in the 1980s (when tons of weird shit originated, let’s be honest). That’s when a mysterious group calling themselves the Monster with 21 Faces set out to blackmail Japanese food giant Ezaki Glico. They even kidnapped the company’s president, though he escaped before any ransom was collected. Next, they set some cars on fire and sent a letter claiming that they’d poisoned Glico’s candies – a bluff that cost the company $21 million when they pulled their products from circulation.

The Monster wasn’t done with the food industry, either, and they eventually turned their attention to another large company – Morinaga. They received a similar letter, but it turned out this time the threat wasn’t empty –  21 boxes were found to be laced with sodium cyanide.

Though, to be fair, the Monster DID label those boxes “contains toxins.” Very polite for a group of super villains.

Despite a few close calls and missed opportunities by the police, none of the Monsters were ever caught. A police superintendent was so disgraced by this fact that he lit himself on fire and died (true story).

In a bizarre and somehow fitting “end” to the story, the Monster himself (themselves?) faded from existence. This was their final statement:

“We are bad guys. That means we’ve got more to do other than bullying companies. It’s fun to lead a bad man’s life.”

Okay then.

1. The Taman Shud Case

In 1948, a deceased male was found underneath a street lamp at Somerton Beach, in Australia. Aside from an article of clothing that was determined to have been made in America, there’s literally nothing known about the man – his dental records and fingerprints didn’t show up anywhere and all of the labels were ripped out of his clothes.

Photo Credit: Unsolved Mysteries

The autopsy was a total bust, as it found only that the man was in great health and had recently eaten a pastry. There was evidence of poisoning – congestion in his brain and stomach, plus an enlarged spleen – but no poison to be found in his blood.

But here’s the weird part.

In a secret pocket in his pants was a scrap of paper that read “Tamam Shud.” The phrase means ‘ended’ or ‘finished,’ and appeared to have been ripped from a book.

The book was a collection of poems called The Rubaiyat of Omar Khayyam – and a particularly rare one at that. A copy of the book was found in the backseat of some random dude’s car around the same time and location where the man was found dead.

Told you. Weird.

And yet, there’s more.

In the back of the book was a code (below). It seems to be a cipher of some sort, but one that’s never been figured out or cracked, even today. So, who was this guy? What was up with the codes? Where did he come from?

Photo Credit: The Unredacted

Maybe someone, someday, will crack that code. Or maybe not.

h/t: Cracked

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