Drone photos and historical documents suggest that Leonardo da Vinci based the bridge that appears in the backdrop of the Mona Lisa on a very real bridge located in the Italian province of Arezzo.

The collapse of the U.S.S.R. came in December 1991 after controversial policies introduced by Mikhail Gorbachev and growing internal conflict brought an end to the 74-year rule of the global superpower.

The hospital had been used to house yellow fever patients before falling into disuse in 1900, then gradually slipping below the waterline in Dry Tortugas National Park off the coast of Florida.

Concealed inside a small pot, the coins may have been hidden away for safekeeping by a soldier or a businessman during a turbulent moment in Roman history.

From September 2003 to July 2004, Yoo Young-chul killed at least 20 people in Seoul, making him the deadliest serial killer in South Korean history.

The mask dates back to the Yayoi period between 300 B.C.E. and 300 C.E., a turbulent time when Japanese society transitioned from hunting and gathering to agriculture.

A convicted child molester from Vallejo, California, Arthur Leigh Allen was the only Zodiac Killer suspect ever named by police — but was he really the murderer?

The calls helped otherwise-isolated parrots create social bonds, boosting their confidence and making them calmer.

From the 16th until the 19th century, women accused of being scolds, shrews, or having "loose morals" were often fitted masks known as Scold's Bridles that held their tongues with an iron gag.

Sparked by years of growing tension between different religious, political, and socioeconomic groups, the Lebanese Civil War exploded in 1975 — and endured for 15 turbulent years.

Miriam Rodríguez spent years tracking down her daughter's killers, one by one, until she was murdered on Mother's Day in 2017.