From Che Guevara to Charlie Chaplin to the Challenger space shuttle crew, these poignant photos capture historical figures who left a lasting mark on the world.

Egyptologist Nicholas Reeves thinks there are multiple hidden chambers inside King Tut's tomb that could contain the long lost remains of Queen Nefertiti.

In November 1939, the Red Army invaded Finland for what they thought would be a quick and easy territory grab, but the heavily outnumbered Finns held them off for three months in what became known as the Winter War.

Starring in Buffalo Bill's Wild West show, Annie Oakley made a name for herself as one of the first female celebrities in sharpshooting.

After the stock market crashed in October 1929, the Great Depression soon followed — ushering in a period of widespread unemployment, homelessness, and destitution.

Lake Natron in northern Tanzania is so alkaline that just three species of fish can survive in its waters, and it calcifies birds that die on its shores.

A successful businessman in Fall River, Massachusetts, Andrew Borden was killed in an ax murder that claimed both him and his wife Abby on August 4, 1892.

Elasmotherium sibiricum was a massive rhinoceros that once lived in the grasslands of Eurasia and could grow to the size of an elephant.

Hundreds of nearly-identical castles were built onto the Turkish hillside at Burj al Babas — but not a soul lives there.

Step inside the enormous, otherworldly tunnels of Vietnam's Hang Son Doong Cave, the largest cave on the planet.

Around 10,000 years ago, most woolly mammoths vanished from the Earth — but a small herd survived on Wrangel Island off the coast of Siberia until 1650 B.C.E.