Super high-tech and sparkling-clean, this three-level spa, which opened in February 2007, seems like an unlikely fit for 33rd Street. Buried in Koreatown, the 12,000-square-foot traditional Asian-style spa houses four igloolike saunas (the Hwangto Dry Grotto, Crystal & Jade Dry Grotto, Crystal & Jade Steam Grotto, and Stone Ice Grotto), which contain minerals and salts for bettering your skin. After enjoying the saunas, your technician will shepherd you to one of the many treatment rooms—dedicated to everything from teeth-whitening ($300) and massages (start at $75) to Asian body scrubs (start at $120) and microdermabrasion facials (start at $120). Bonus: The spa is open seven days a week, from 10am to 2am. Sounds like an excuse for a ladies night!