At first glance, it looks like a plain, white room with a couple rows of cozy blue chairs. But then the sunlight reveals something interesting: the walls and ceiling are textured, and even seem to emit some subtle, glittering glints. Stepping inside reveals that there's no hard floor, either, just crunchy salt dunes underfoot. This saline retreat?and the kid's version, with as many toys as chairs?offers relaxing, 45-minute stays designed to improve respiratory and allergen-related health. While reading a magazine or napping, the airborne crystals are exhaled and inhaled, which can help alleviate sneezing, coughing, headaches, and skin rashes such as eczema.