Known as the "City of Darkness," Kowloon Walled City was a largely ungoverned Chinese enclave in British Hong Kong that contained up to 35,000 people by the 1980s.

From the Five Families of the New York Mafia to organized crime kingpins in Chicago and beyond, these mob bosses ruthlessly ruled the underworld.

Depictions of marine wildlife ranging from octopuses to eels make these mosaics unlike anything ever found in the region before.

Robert “Rosie” Rosenthal flew 52 missions as an American bomber pilot and survived being shot down twice during World War II. Then, he used his law degree to prosecute Nazis at Nuremberg.

The colorful green and white vase purchased at a Virginia Goodwill turned out to be a rare piece by Italian artist Carlo Scarpa.

From makeshift trees on the front lines to bombs painted with "Merry Xmas Adolf," see how soldiers and their loved ones back home celebrated Christmas in the U.S., Europe, and the Pacific during World War II.

The battle was likely fought around 15 B.C.E. between Roman troops and local Suanetes fighters, who lost the bout.

The dolphin's deformed flippers are likely the result of a genetic defect, but the creature is "thriving" nonetheless.

Since the Great Depression, Skid Row in Los Angeles has been infamous for its condensed homeless population, poverty, and crime.

The mace head, discovered by accident in Wilków, Poland, may date as far back as the 12th century.

From the Winter War to the Soviet invasion of Hungary to the present day, the homemade "bottle bomb" known as the Molotov cocktail has long been a weapon of choice for guerrillas and revolutionaries around the world.