"It might seem odd to tell travelers to hang out in an airport, but Jewel Changi is no ordinary airport (it's a fixture at the top of our Readers' Choice Awards best airport list ). The transportation hub is also a nature-themed shopping, dining, and entertainment extravaganza designed by architect Moshe Safdie. The project's highlights include the Rain Vortex, a seven-story-tall indoor waterfall; an indoor forest with suspended walkways; and nearly 300 stores. This is a game-changer for travelers on layovers. It's so popular (and so worth it) that 20 airlines will let you check in a full 24 hours in advance just to maximize your time inside." - Ashlea Halpern