A unique form of singing that produces two tones simultaneously has remained an enigma for many years.
Access to the wreck of the world-famous vessel, which sank in 1912, has long remained a point of contention.
This enigmatic order has remained at the center of conspiracy theories and historical debates for centuries.
A student in Glasgow has deciphered a shorthand code that has remained an enigma for generations.
A mysterious room in Darwin's former Reserve Bank building has remained firmly locked for decades.
The enormous circle of ice formed in freezing weather in the Presumpscot River on Tuesday afternoon.
Hunter and fisherman Greg Strand captured footage of the colorless animal in the woods earlier this month.
Authorities in Maine were left perplexed recently when an ATM machine was found miles from anywhere.
Tia Wilson of Durham, Maine captured the eerie image on a game camera she had set up in her garden.
Considered to be a 'living fossil', the frilled shark has remained unchanged for over 80 million years.
Astronaut Scott Kelly spent 340 days aboard the space station while his twin brother remained on Earth.
Scientists have discovered a superbug that has remained isolated underground for millions of years.
The mysterious Victorian mansion has remained a place of intrigue since Sarah Winchester's death in 1922.
A mysterious snakeskin found in Maine recently has turned out to be from a very large snake indeed.
A huge snakeskin measuring 12ft in length has been found near Riverbank Park in the US state of Maine.
The origins of a granite marker on an island in Massachusetts have remained a mystery for years.
Land art and sculpture artist David Allen has captured footage of a peculiar natural phenomenon in Maine.
Bill Brock has been investigating two recordings which show a mysterious figure out in the woods.
A local witness reported a strange object which remained in the vicinity for almost two hours.
Teenager Meghan LaPlante discovered the crustacean while checking lobster traps at the weekend.