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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)

Despite its dry desert landscapes, Utah is a land of surprises, and Glen Canyon is one of them, rivaling Arizona's Grand Canyon for sheer majesty.

Utah's Otherworldly Landscapes (2:20)

It's commonly known that a single asteroid set off the dinosaurs' extinction. Even more destructive than its impact was the chain of events it set into motion.

How a Single Asteroid Wiped Dinosaurs Off This Planet (1:14)

In 1828, John Jacob Astor built a trading post on the Missouri River. Business was so profitable that it only took four decades for Astor to become America's first multimillionaire.

America's First Multimillionaire (2:49)