Peninsula Spa by Espa
Credit:
Mark Wieland Photography
The grande dame of luxury hotel spas in Manhattan—with a huge amount of space, to boot. This is a hushed oasis of calm, complete with a pool, ten spacious treatment rooms, and an Asian tea lounge. Splurge on one of the ESPA facials, or a Thai-inspired massage done by a therapist trained at Bangkok's Wat Pho temple.