In 2000, Rodney Marks died suddenly from methanol poisoning in a remote research station in Antarctica. Nearly 20 years later, the circumstances surrounding his death remain a mystery.

MYSTERY
The village of Plougastel-Daoulas in Brittany, France is home to a stone with a mysterious message that could date back centuries.
Charles Dickens died without revealing the ending of his last book, "The Mystery of Edwin Drood." But he came close to sharing the secret with Queen Victoria.
Ken Rex McElroy was gunned down in cold blood as dozens of Skidmore, Missouri residents watched. No one was ever prosecuted for the crime.
Since the 1980s, novelty phones in the shape of the comic strip character Garfield have mysteriously been washing ashore in France. Now we know why.
The pickle jar along I-270 North near Des Peres, Missouri has been confusing drivers since 2012. No one knows where it came from, what it means, or if sandwiches will follow.
Punxsutawney Phil's moniker might have something to do with the royal family, a pair of heinous groundhog murders, and some good old-fashioned small-town competition.
More than 500 people confessed to the crime, but no charges have ever been filed.
In 1969, the government shut down its infamous study into UFOs—and people have been talking about it ever since.
Explorers often push the boundaries of survival in the name of glory, so it’s no great surprise that many have gone missing.
In 1911, Leonardo da Vinci's most famous work went missing. A tip from an admitted art thief seemed to implicate one of the world's best painters.
The story of a missing man, a damning confession, and a surprise witness who would shock the courtroom.
A disturbing discovery in a piece of luggage only added to the legends.
The fishermen of Gloucester, Massachusetts thought they had seen everything. Then they were proved wrong.
For a small percentage of the population, buttons aren't just a clasp for clothing. They're a nightmare.
Over the course of a century, several theories have arisen to explain the true cause of Nora Emily Fornario's death.