Don unlocks the medical mystery that defined a famous pair of conjoined twins, studies an umbrella that played a critical role in a bizarre Cold War assassination and visits a jail cell that holds a secret about Al Capone.

Don investigates the sinister secrets behind an innocent-looking rag doll, studies an engineering disaster and examines a journal that inspired a one of the most haunting works of American literature.

Don inspects a khaki uniform that witnessed an experiment gone wrong, a manuscript that may change everything about the life and death of a notorious outlaw of the Wild West and the remains of Ice Age giants.

Don unlocks the secrets of an infamous drug syndicate, examines a gold ingot recovered from a long-lost sunken treasure and inspects a fragment of a mysterious aircraft that crashed near an infamous military base.

Don uncovers the cause of one of the worst maritime disasters in American history, investigates cryptic markings that may be a map to legendary gold mine and examines an ax wielded by a killer in a bizarre double murder.

Don investigates one of the biggest spy cases of the Cold War, unlocks the secrets behind a gruesome crime spree and examines evidence that may prove the existence of a legendary sea beast.

Don examines what appears to be a miniature human head from the jungles of South America, discovers the harrowing details of an Arctic expedition that ended in disaster and investigates a horrifying nuclear accident.

Don inspects a pair of shoes that starred in one of the most gruesome tales of the Wild West, examines a miniature spacesuit worn by an unconventional space pioneer and unveils the cryptic contents of an antique scroll.

Don examines a simple cardboard box once tied to a deadly outbreak, inspects a small pill bottle that may shed light on an icon's untimely death and investigates why a Civil War submarine vanished without a trace.

Don investigates America's only known state lottery fixing scam, one of the the most harrowing hijackings in recent memory and a bizarre ghost sighting tied to the wreckage of jumbo jet plane.

Don examines an automobile designed to take to the skies, inspects a circular saw once wielded in a terrifying prison riot and investigates a fire that decimated Coney Island's most extravagant amusement park.

Don investigates a legendary heist, examines the biggest manhunt in American military history and reveals the sinister secrets behind a bizarre preserved beast that once terrorized a community of settlers.

Don inspects a 100-year old tissue sample that sent a doctor to the gallows, a collection of birds killed by a mysterious epidemic and a kettle used by a group of settlers to cook up a ghastly stew.

Don investigates one of the nation's weirdest industrial disasters, the criminal behind the only unsolved airplane hijacking in US history and a rock and roll pioneer whose tragic early death prompted rumors of a curse.

Don examines a close encounter with otherworldly creatures on a Kentucky farm, a set of brass knuckles that protected a president from a nefarious plot and a makeshift prison used by a secret society to confine a traitor.

Don examines the only known evidence of a controversial machine, investigates a limousine that played a central role in an assassination attempt and inspects a giant book filled with vivid illustrations of mysterious birds.

Don investigates an author's mysterious death, a sunken space capsule that provides clues to a NASA disaster and a controversial medical manual that lies at the center of a rash of deaths in the Pacific Northwest.

Don examines a mysterious box that holds clues to Hollywood's most infamous unsolved murder, inspects a strange bust of a monstrous figure and investigates a notorious and deadly domestic terrorist attack.

Don inspects a jar of tiny organisms that inspired an iconic horror film, admires a legendary diamond rumored to bring misfortune to those who contact it and examines one of the most bizarre cases in medical history.

Don investigates a three-foot-tall cross tied to a notorious paranormal event, examines the footprint of a strange bayou beast and inspects a simple cigar box linked to the 20th century's greatest fictional secret agent.

Don investigates a wearable computer used in an audacious gaming scheme, a bizarre weapon of war that's literally controlled by pigeons and a custom-made suit of armor that helped perpetuate the longest street battles in America.

Don inspects a uniform worn by a highly unorthodox doctor, examines an antique bell linked to a legendary beast and investigates a massive stone monolith that may hold the key to the downfall of an ancient civilization.