Discover Serenity, a $44M Beverly Hills mansion for sale that features a hidden spa, 4,400-pound marble tub, rooftop deck, infinity pool, and panoramic views.

At the Ritz-Carlton, 1881 Curtis St. in Denver, a $75 spa pass gives you access to a steam room, fitness center and hot tub, as well as 15% off on any food and beverage purchases. Of course, you ...