The Most Beautiful Spas in the World — and Which Treatments to Try!

Spa overview: Spa Castle is a venue to visit with a friend (or lover!). It's easy to spend an entire day at the massive Midtown space, so you're going to want a buddy. Here's the abbreviated overview: the three-floor space includes an indoor rooftop hot tub pool (with a bar!), a Korean BBQ restaurant, a full spa (where you can get massages, facials, etc.), and six themed saunas (including rooms featuring salt, ice, chromotherapy, charcoal, gold, and far infrared heat). There are also more places to bathe and detox in the nude within the men's and women's locker rooms — though while you're out in the coed spots, you'll need to wear a bathing suit and the provided uniforms (top and shorts).