Las Vegas has taken tourists to the height of their imaginations while reaching into their pockets. Visit 11 of the world's largest hotels in America's biggest playground.

To run faster, jump higher and play longer is the ultimate goal of all athletes. But when training runs its course, science and technology jump in.

From ancient times to today's cutting-edge technology, we chronicle the long history of prosthetic devices.

First there were balloons and blimps. Then, visionaries enlarged, reinforced and motorized them and the airship was born. We explore their history.