Commissioned and owned by Morocco’s King Mohammed VI, the Royal Mansour is the definition of opulence. Case in point: It took more than 1,500 local artisans to build the royal tribute to Moroccan architecture. Rather than rooms, guests stay in one of 53 private riads spread across several acres of fragrant gardens. The Royal Mansour’s crown jewel is the spa, an elaborate atrium made of white metal lacework that resembles a (very fabulous) birdcage.