Don't worry -- these furry felines are safe and sound inside MGM Grand's lush, $9 million Lion Habitat. See these stunning African lions through a soundproof, one-and-a-half-inch thick glass window as they play, groom and of course -- nap.

There's greenery and even a waterfall to make the lions feel at home. The climate-controlled habitat has purified air and water. Lions come alone, in pairs or sometimes three at a time for a few hours. And since trainers rotate the lions twice daily, you'll always see a different set of cats.