The Tunguska event: the largest explosion in modern history left no crater
Tunguska, Siberia, Russia, 1908 Partly explained
All cases
Every case in the archive, newest first.
Queimada Grande Island: the "most dangerous island in the world" is in Brazil, and almost no one can visit it
Queimada Grande Island, São Paulo coast, Brazil, 9,000 BC Partly explained
The Count of Saint-Germain: the man who seemed centuries old and never denied it
Versailles, Eckernförde and other European courts, 1784 Under debate
The Wow! signal: 72 seconds of transmission from space that no one has repeated or explained
Big Ear radio telescope, Ohio, United States, 1977 Open
Göbekli Tepe: the temple built 7,000 years before the pyramids, by hunters without farming
Göbekli Tepe, Şanlıurfa, Turkey, 9,500 BC Partly explained
Kaspar Hauser: the boy who came out of nowhere and was stabbed before he could tell his story
Nuremberg and Ansbach, Bavaria, Germany, 1828 Under debate
Flight MH370: what the data reveals and why the largest missing aircraft in history has still not been found
Southern Indian Ocean, west of Australia, 2014 Under debate
The Nazca Lines: who drew them, why, and why they only make sense from above
Pampa de Nazca, between Nazca and Palpa, Peru, 100 BC Partly explained
Rasputin: what the secret Russian files revealed and what they still hide
St. Petersburg, Russia, 1916 Partly explained
The Voynich manuscript: the book in an unknown language that has defeated a century of codebreakers
Beinecke Library, Yale University, United States, 1421 Under debate
The Great Pyramid of Giza: hidden chambers, extreme precision and what modern scanners found
Giza, Egypt, 2,560 BC Partly explained
Nikola Tesla: the experiments the US government seized and what really happened to his papers
Hotel New Yorker, Manhattan, New York, United States, 1943 Partly explained