Did you know Houston is home to the largest number of theater seats outside of New York City? Houston, America's fourth-largest city, is a cosmopolitan destination, offering world-class dining, arts and culture, shopping and exciting nightlife. Discover a thriving arts scene, with ballet, opera, symphony and theater. NASA and the Texas Medical Center, along with 25 Fortune 500 corporations, are headquartered in Houston. The Houston Livestock Show and Rodeo, the largest rodeo in the world, lasts three weeks and features some of the biggest country music stars.