If I missed any mysterious, unsolved mystery or mysterious place, tell me about it!
Stonehenge
Crop Circles
D. B. Cooper
American Stonehenge
The Georgia Guidestones
Jack the Ripper
Jack the Stripper (1960's copycat of the original)
The Bermuda Triangle
Atlantis
The Patomskiy Crater
The Taulas Of Menorca
The Melungeons
The Bouvet Island Lifeboat
The Mayerling Incident
The Redpath Mansion
The Eilean Mor Lighthouse Mystery
Amilia Earhart
The Hollow Earth
The Tamám Shud case
The Dyatlov Pass incident
The Fate of Hitler’s Stolen Wealth
The Disappearance of the USS Cyclops
Secrets of the Phaistos Disc
Genghis Khan’s Final Resting Place
Pinpointing the Star of Bethlehem
Voynich Manuscript
Kryptos
The Zodiac Killer
Beale Ciphers
Shugborough inscription
Rongorongo
The Moai statues of Easter Island
The Confederate Treasury
Oak Island Money Pit
The Disappearance of Jimmy Hoffa
The Amber Room
The Crystal Skulls
JFK's Assassination
SS Ourang Medan
Aluminum Wedge of Aiud
The Max Headroom Broadcast Interruption
Cicada3301
The Pollock Twins
Saint Germain, the Immortal Count
The Dighton Rock
Mary Celeste
The Aliens of the World Archive (Febuary 14)
SergiEfeve
In mysterious places can be the Geoglyphs of Nazca (Perú) and Arica (Chile), like the Tarapaca Giant (aka Atacama Giant), Chiza geoglyphs, Tiliviche geoglyphs and Cerro Pintados geoglyphs, between others.