Four Seasons Hotel Bahrain Bay

What the classifiers highlight

A bridge leads onto the private island holding this H-shaped tower, designed by the same firm behind the Burj Khalifa. Forbes counts 273 rooms styled after 1930s ocean liners, a 37,512-square-foot spa across four linked buildings, and a children's waterpark shaped like a traditional Bahraini vessel with seven slides. Two restaurants come from Wolfgang Puck.