A 190-degree underground chamber. A three-story tropical waterfall. A warm pond with ginseng or seaweed. You don’t have to visit the tropics to enjoy these therapeutic treats—you’ll find them all in New York City spas. The City’s spa culture features the usual pamper-yourself treatments and blissful massages, plus more exotic offerings like a luxurious red-wine soak in a hot tub and a traditional Russian platza—an exfoliating, rejuvenating thrashing with oak tree leaves. Intrigued? Here’s a roundup of the best spas for those who want to come in for a relaxing break from the cold this winter.