In medieval Britain, the sauna was where King Arthur and his cronies could take off their armor, mend their jousting wounds, and inspect each other's kneecaps for bits of errant moss. Relax like the Knights of the Round Sauna with today’s Groupon: for $14, you get one admission to King Spa & Sauna (up to a $27 value). This Groupon is valid for 24 consecutive hours after check-in.

Modeled after traditional Korean Jjim-Jil-Bang spas, King Spa & Sauna has 11 soothing sauna rooms to calm jangled nerves and dissipate lingering stress. Natural elements inspire each room's healing method, from the swirling whirlpools and jasmine aromas that soothe the spirit in the separate men’s and women's spas to the bamboo and minerals that excavate toxins from the body inside the Yellow-Soil Crystal Room. King’s Fire Sudatorium is a massive sauna composed of living rock, dry heat, and an oak-tree scent meant to revive peaceful memories of summers spent as a wood nymph. Activate energy within the gentle heat and gold-plated walls of the Pyramid Room, or shrink pores in the North Pole-esque chill of the Ice Room.

Because admission is good for up to 24 hours but doesn't allow re-entry, sauna-navigators can periodically take breaks at the onsite pool, karaoke rooms (free for reserved parties of four or more), and movie theater, or by relishing an iced rice drink and broiled-beef short ribs at the food court. Every room but the men's and women's spas are unisex, so King Spa provides each visitor with a uniform and invisibility cloak that must be worn to maintain modesty. Like the eyes of an insomniac or the mouth of an especially talkative insomniac, the spa is open 24 hours a day, seven days a week. Check out the spa guide for tips on how to best take advantage of the spa's amenities.