What defines a great hotel now? Travel + Leisure editors crisscrossed the globe to find out. From urban oases to jungle retreats, from a castle fit for the Sun King to the latest from hotel czar Ian Schrager, we considered hundreds of contenders, weighing their pedigrees and potential. Here, our picks of the year's 15 coolest new hotels, including an exclusive look at some of the most anticipated debuts on the horizon. Each of these singular properties embodies what a hotel can (and should) be. Let the buzz begin...