King Sauna is a trip to another country—but you don't have to bring a passport or sit on an airplane for hours. At this Korean jjim-jil-bang sauna, rooms ranging from cold (the ice room) to extremely hot (the fire sudatorium) help you sweat and relax. Americans may not normally equate sweating with relaxation, but if you just surrender to it, the heat soothes aches and leaves you feeling peaceful. Hot tubs, including a tea-tinged one and a powerful jetted tub, relax you further, and a cold plunge pool (64 degrees when we were there), is a bracing refreshment. For extra stimulation (and for an extra fee), get a percussive massage or a vigorous body scrub. Don't be surprised to see other spa visitors sleeping in the movie theater (yes, there's a movie theater) or in the common areas; in Korea, these types of spas are used as a kind of hostel for traveling families. In fact, your $18 entry fee gets you in for 24 hours, so sleep there if you like—bet it's the cheapest day you've ever spent in another culture.