A popular actor from the silent film era, Ramon Novarro was murdered in 1968 by two brothers that he'd hired as escorts.

While stationed in Budapest, Raoul Wallenberg did whatever he could to save Hungarian Jews from the horrors of the Holocaust — but he tragically disappeared just as World War II was coming to an end.

Winston and Clementine Churchill were married for 56 years, during which she supported her powerful husband through countless personal and political challenges.

Known as the "father of modern gynecology," J. Marion Sims pioneered multiple techniques and instruments — but his exploitation of enslaved women as test subjects in 1840s Alabama remains controversial to this day.

For decades, detectives have worked to solve the mystery of the lost Martin family, and while it's possible they simply veered off of a cliff during their drive, some suspect they were murdered.

Ellis Island Hospital operated between 1892 and 1951, treating some 275,000 newly arrived immigrants to the United States, but this historic facility sits abandoned today.

A popular British actor, Leslie Howard died after his plane was shot down by the Nazis in 1943 — and some believe that he was specifically targeted due to his alleged covert activities during World War II.

Babe Ruth died in 1948 after he'd been diagnosed with a rare type of cancer known as nasopharyngeal carcinoma.

On October 29, 1929, investors lost more than $25 billion during the Black Tuesday stock market crash that brought the Roaring Twenties to a screeching halt.

Frederick Fleet quickly raised the alarm after spotting an iceberg on the night of April 14, 1912, but it was too late for the Titanic to avoid a catastrophic collision.