There are plenty of luxuriant Spas in Europe, from the Bulgari Spa in Milano and its great load of massages, the Dolder Grand Spa in Zurich and its unique decoration, The Majestic Hotel's Spa in Barcelona and its incredible view of La Sagrada Familia and its numerous treatments and many others.
You can find a great amount of Spas on
http://www.spa-leaders.com and not only in Europe. Each Spa has its description and the list of all treatments proposed, and also the name of the hotel partnered or in which the Spa is located.