Who stole $500 million worth of paintings from Boston's Isabella Stewart Gardner Museum over 30 years ago? The Museum is offering a $10 million reward for information leading directly to the safe return of the stolen works. -u/Back2Bach

“The disappearances of D. B. Cooper and Ray Gricar.” - mandobaxter , “They found a bunch of D. B. Cooper's money awhile ago. It was found by some kid digging around in the sand on the side of a river. Most likely explanation is that he jumped and smacked the ground at terminal velocity. The money manages to drift down the river and get buried over decades.” - r_a_butt_lol

In my hometown of Sulphur Springs, Texas a firefighter named Michael Chambers went missing a few years ago. Totally normal dude, super humble. Pillar of the community type of guy. They found blood in his garage that was his, and the police said he must have rode a bike some ridiculous amount of distance away and jumped into a lake as a suicide attempt.

They have little to no evidence for that conclusion. Well the case gets weirder. When this small town community found out that Michael's wife was sleeping with the chief of police at the time. About 40 percent of the community thinks the police killed Michael and covered it up. Please anyone look into it, it gets so much deeper and is an interesting story.” -u/Good-of-Rome

“WHO WERE THE SEA PEOPLES?? https://en.m.wikipedia.org/wiki/Sea_Peoples” - NMJD

One night I was woken up by a screaming man in the street. He was screaming "POLICE, POLICE, SOMEONE CALL THE POLICE. I'VE BEEN KIDNAPPED." A woman in front of him (apparently his GF) was saying in tears "Are you insane? What are you talking about? You just proposed to me! What are you saying?" A few minutes passed, everyone in my building was watching from their windows when three police cars appeared.

Both the man and the woman calmly started talking with the police. After a few more minutes, the woman entered their car and said "I'm going, ok? But never look for me again." The man kept talking with the cops for a little while. Later he got into an Uber and left. I would love to know what happened that night. -u/embalajunco

“What the fuck happened to my Moondancer My Little Pony toy as a child? She was my favorite pony, and one day while playing, she fell behind my dresser. When my dad pulled the dresser out, she was gone. I have no clue how a piece of plastic disappears over the course of 4 hours when no one had been in the room. I still have ALL my MLP pony toys, but I still miss that one.” - dementedpixie

Are there aliens? Like, not just alien bacteria but something with the intelligence of animals, or the potential to be as smart or smarter than humans. -u/I_Love_Small_Breasts

“The disappearance of Mekayla Bali, everything about it makes me uneasy. https://en.m.wikipedia.org/wiki/Disappearance_of_Mekayla_Bali“ - frostysushituna

“I saw a video once of this dude who was in an airport, and he looked scared. He took off running and left the airport and was never seen again.” - passthegrass4201

Who killed Libby and Abby in Delphi, Indiana? Two girls were hiking on the Monon High Bridge, and their bodies were found a day later on the creek bed below. The biggest lead was a photo of a man on the same bridge taken from Libby's phone -u/Dog_man_star1517

“who is the Somerton man and how/why did he die .” - MrBinkie

What happened to Claudia Lawrence? I was 21 when she went missing and she was 35. I’m 35 this year and I can’t believe she’s never been found. Background: She was a chef in York, England. She finished her shift at 2pm on March 18th 2009 and went home. She spoke to both her parents on the phone and her mobile phone was active until the evening showing texts sent and/or received. She told her mum on the phone she was going to bed early as she was back on a 6am shift the next day.

She never showed for work. She was due to meet a friend for dinner/drinks that night and again never showed. U.K. police presumed her murdered but there is no evidence at all of where she is or any crime etc.

One Sky News journalist stated, "Claudia had some unusual acquaintances and this remains the only missing persons case where I have been warned off or threatened - not once but twice." -u/Tough_Guitar_5263

What actually happened to JonBenet Ramsey? -u/thestuffofthought

I keep being drawn back to the mystery of Bobby Dunbar. It's just a great example of how crazy our world is sometimes. The TL;DR is this: A boy goes missing, and is found in the company of an itinerant handy man, who claims he was sold/given the boy as a sort of apprenticeship situation. They return Bobby to his parents.

At first the mother identified him as being her son, but soon came to believe the boy was not. 90+ years later, a family member proved with DNA evidence that "Bobby" was indeed not the same boy. This caused a massive rift in the family between those wanting to accept and move on, and those who thought the past shouldn't be disturbed. But what happened to the real Bobby Dunbar? -u/AKeeneyedguy

Deciphering the Indus Valley Script. -u/estatearika

I would love to know who the Zodiac Killer really is. -u/BongHitBonanza

There was a lady here in Wales, Trevaline Evans who put a sign in the window of her shop that said "Back in 2 minutes." She vanished without a trace. -u/Dirk_diggler22

What exactly consciousness is. -u/UpsettiSpaghetti4210

What is ACTUALLY going on inside black holes? What happens beyond the event horizon? What happens to the information? What actually lies in place of the singularity? -u/ToastaHands

Where is Jimmy Hoffa? -u/Happytwinkletoes1

What the universe is. -u/UniversallySecluded

If the prawns ever come back from District 9. - u/ForcedToDecay

Where is Madeline McCann? I'm pretty sure the little girl is dead but I'd like whoever did it brought to justice. -u/BigD1970

What comes after death? -u/Embarrassed_Finger47

If the previous owner of my house was really a serial killer, as everyone says...-u/airplanep2