A posting on Facebook has helped to solve the mystery of what happened to French skier Henri Le Masne.
The latest search for answers concerning the fate of the missing airliner has come up empty.
A sonar search for flight MH370 has uncovered the wrecks of two ships that went missing in the 1800s.
The wreckage of one of Germany's most advanced U-boats has been discovered off the coast of Denmark.
A swimming club in Australia has appealed for ships to keep a look out for its recently escaped mascot.
A man who went missing in New York was later found 3,000 miles away and nobody knows how he got there.
New footage has emerged showing a large chunk of ice narrowly missing pedestrians on a London street.
A US-based exploration firm is set to begin hunting for the whereabouts of the missing plane's wreckage.
A long-standing mystery concerning the whereabouts of the universe's missing matter has been solved.
The mystery surrounding a dinosaur made up of various mismatched body parts has finally been solved.
Two priceless candlesticks that went missing years ago have suddenly turned up again in plain sight.
14-year-old Yana Tamocheva went missing while picking berries in Siberia's remote Krasnoyarsk region.
A beach that was stripped of its sand three decades ago has suddenly been restored to its former glory.
A new radar technique has made it possible to locate a derelict spacecraft in orbit around the Moon.
A photograph of six women sitting on a sofa has gone viral online due to a rather peculiar abnormality.
A diver believes that he may have discovered a missing nuclear weapon at the bottom of the Arctic Ocean.
The mystery of a missing British explorer ship which disappeared in the Arctic in 1845 has been solved.
Dozens of cats have been going missing under mysterious circumstances in the town of Frauenkirchen.
The final resting place of a missing boat called the Darlwyne has been located after five decades.
Scientists have been attempting to determine why the dwarf planet Ceres has no large craters at all.