Nicknamed the "King of Cocaine," Pablo Escobar founded the Medellín Cartel and had an estimated net worth of $30 billion when he died in 1993.

Challenger Deep lies 35,876 feet beneath the surface of the Pacific Ocean within the Mariana Trench, and the explorers who have ventured into its depths have spotted otherworldly landscapes, bizarre sea creatures, and even human trash.

Also known as "hanging in chains," gibbeting often involved locking criminals in human-shaped cages and hanging them up in public areas as a warning to others.

Built by Krupp in 1941, the Schwerer Gustav railway gun was the Nazis' "miracle weapon" that could blast through 20 feet of concrete from nearly 30 miles away.

From Parisian flower sellers to Chinese monks, see what the world actually looked like a century ago with these striking autochrome images.

Exhibited as curiosities in the 19th century, conjoined twin brothers Chang and Eng Bunker were two of America's most infamous showmen.

Neolithic cobra pottery unearthed in Taiwan, missing half of Ramses II statue found in Egypt, mass grave filled with plague victims discovered in Germany.

Kim Peek's one-of-a-kind brain allowed him to read two pages of a book at once, recite the day of the week for any date in history, and memorize some 12,000 volumes.

Sweater from 1807 found inside a sealed parcel in the UK, 8,600-year-old bread discovered in Turkey, medieval badge depicting a basilisk unearthed in Poland.

Porridge-covered Stone Age pot unearthed in Germany, colonial armor discovered in Maryland, ancient bronze hand inscribed with mysterious writing found in Spain.

Roman funerary urn unearthed in Italy, 19th-century chocolate factory discovered in Spain, Iron Age cemetery found with humans alongside dogs and horses.