7. KFC Yum! Center, Louisville, Kentucky
Terrible name, great arena. (After the fast-food chicken chain bought the naming rights for $13.5 million, one local columnist wrote: "We're going to have to retrofit the arena's fountain nozzles to accommodate gravy.") But the three-year-old, $238 million home of the University of Louisville's sports teams is state-of-the-art everything, it's built near a waterfall on the Ohio River and its glass façade, wavy interior ceilings and art installations give it a modern feel. It gets big-name headliners, too, and not just last year's NCAA hoops champions. The Eagles played the first show here in October 2010; Lady Gaga, Taylor Swift, Bruce Springsteen, Carrie Underwood and Justin Bieber came later.
Fun fact: Populous, the stadium-designing specialists responsible for London's Wembley Stadium, New York's Yankee Stadium and numerous others, handled the architecture.