Most of us would not list "the airport" as an ideal place to spend time. Crowded, stale, often barren of food and drink, most of us approach airports as a necessary evil we must pass through in order to get to where we're going. (Hopefully, on vacation.) Well, weary travelers, not all airports are created equal. These 11 hubs—which feature everything from nap hotels to aquariums—are so worth a visit, they might even make you excited to wait in the security line.