If you feel like running away to Palm Springs or Miami but have obligations in the city, this is the spa for you. It's just on the fringes of the city limits over in Western Paris's Auteuil, near the famous tennis stadium, Roland Garros. The vastness of these spa facilities underneath the near Olympic-sized pools (yes, there are two, one that is the summer pool and the other, the winter pool, both heated year-round to a perfect 85°) dwarfs every other spa in central Paris.