Bath, England - Thermae Bath Spa

Having been mothballed for 28 years (after the accidental death of a schoolgirl), the waters that gave this city its name (Aquae Sulis in Latin), are once again being used in therapeutic ways-this time in a new state-of-the-art complex. Designed by noted architect Nicholas Grimshaw, Thermae Bath Spa, Britain's lone natural spring spa was built at an estimated cost of $48 million, just a stone's throw from the city's celebrated Roman baths (now a historical site). The vertical spa, with a communal subterranean pool and another rooftop one bookending levels where massages are administered and where guests enjoy cylindrical steam rooms done-up in glass, is a modernist experience in a palladium-style townhouse that's popular with people of all ages, who soak away in water that comes to the surface at a steamy 113 degrees Fahrenheit and is said to cure ailments ranging from arthritis and rheumatic disorders to asthma and infertility.

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