For those seeking more than just a good night's rest, a slew of popular luxury hotels from New York City to Paris are opening spas. The Guerlain Spa at the Waldorf-Astoria hotel in New York offers travelers the Waldorf Impériale, a sensory-renewal body massage and facial, and gives couples the option of booking a double room so they can enjoy it together. In Paris, Christian Dior has set up shop at the Plaza Athénée with the Dior Institut, rejuvenating globetrotters with a hammam and an anti-jet-lag treatment. At Miami Beach's newly renovated Fontainebleau Hotel, celebrity facialist Tracie Martyn has teamed up with the Lapis Spa to offer her age-defying resculpting facials and body treatments.