Though Lebensborn initially focused on encouraging Germans to have more children, the program's directors eventually resorted to kidnapping "biologically valuable" foreign children with Aryan features.

Animal bridges, also known as wildlife crossings, help animals navigate human infrastructure — and they're beautiful to look at.

The 12 members of the Ovitz family were imprisoned at Auschwitz in 1944, where they were experimented on by Josef Mengele.

The New York City Farm Colony lies in ruins today, but it has a dark past as a hospital and poorhouse — and it's even connected to serial killers and boogeymen.

From flying saucer rides to domestic living on the lunar surface, these gorgeous retrofuturism illustrations show how previous generations thought the future might look.

Stories about Mr. Rogers' military career have circulated online since his death in 2003, with some even claiming that he was an ex-Navy SEAL who was covered in tattoos.

Known as "The Dating Game Killer," Rodney Alcala murdered at least four people before his television appearance — and would kill again soon after.

You may know classic Beatles songs like "Hey Jude" or "Yesterday" by heart, but you'll still be surprised to learn the incredible stories behind how they were written.

A Vietnamese man named Ho Khanh first stumbled upon Hang Son Doong in the 1990s, and when British cavers explored it nearly 20 years later, they discovered that it was the largest cave in the world.

From its construction to the aftermath of its sinking, these seldom-seen Titanic photos reveal the infamous tragedy like never before.

These Frida Kahlo photos prove that the renowned Mexican artist lived a painful yet profoundly influential life.

From Butch Cassidy to an 11-year-old car thief to a Jesse James crony still bloody from a posse's beating, these mugshots evoke the true outlaw spirit of the Wild West.