The Las Vegas Strip, a neon-drenched oasis in the Mojave Desert, boasts some of the world's most spectacular theaters. From the Colosseum at Caesars Palace, originally built for Celine Dion's groundbreaking residency, to the O Theatre at Bellagio which houses a 1.5-million-gallon pool - the 4.2-mile stretch includes several state-of-the-art properties. These venues, along with dozens more host over 100 shows nightly and draw 42 million visitors annually, making the city the entertainment capital of the world.