This July 4th, Celebrate Two Million Years of Grilling

The Karez is a modern-day engineering marvel and a prime example of people working with, not against, the forces of nature to deliver their needs—in this case, water.

This Ingenious System Brings Water to the Chinese Desert (3:25)

Free from their mother's care, five young lions must fend for, and feed, themselves. Their first challenge: a giant giraffe who refuses to be caught.

Incredible: Five Lions Take Down a Giraffe (2:49)

Da Vinci's The Last Supper plays a key role in the 2006 blockbuster hit The Da Vinci Code. Although the film's claims are more fiction than fact, could the painting actually contain a message from Leonardo?

Does 'The Last Supper' Really Have a Hidden Meaning? (4:03)

In 1992, Christopher McCandless set off to test if he could survive alone in the wilds of Alaska. It didn't go as planned.

What Happened to Chris McCandless? (3:38)