Philip Markoff was a 23-year-old husband-to-be and medical student in Boston who was also soliciting women off Craigslist to rob and murder.

Experts believe that at least 25 million people died in the Pacific Theater during World War II, with some of the grisliest deaths befalling Chinese civilians who were systematically tortured by the Imperial Japanese Army.

Beginning in the 1840s, young boys called "newsies" sold newspapers in major cities across the U.S. in order to make a living or support their struggling families — and as these photos show, the job wasn't always easy.

Thomas Wadhouse, also known as Thomas Wedders, was an 18th-century circus performer who had the largest nose ever recorded at a whopping 7.5 inches long — but little else is known about his mysterious life.

Throughout the 20th century, Ansel Adams captured stunning black-and-white images of the American West, earning the title of "America's most important landscape photographer."

Using modern technology like drones and 3D scanners, researchers were able to detect footprints left by the crocodile-like rhinesuchid temnospondyl roughly 255 million years ago.

The young snailfish was spotted at a depth of more than 27,000 feet in the Izu-Ogasawara Trench off the coast of Japan.

Still celebrated by the descendants of German immigrants in America today, Belsnickel is a menacing character who bears some similarities to Santa Claus — but has a violent approach all his own.

Cleopatra allegedly died by suicide using a venomous snake in Alexandria on August 12, 30 B.C.E., but some scholars say she may have actually been murdered.

The first person in Germany to write an obstetrics book from a woman's perspective, Justine Siegemund made childbirth safer for both mothers and their children.

During the Holocaust, Willem Arondeus heroically led a raid to destroy a registry office in Amsterdam to prevent the Nazis from identifying Jewish citizens — and it cost him his life.