This architecturally innovative spa is split into four different 'worlds', where experiences stretch from relaxing in radon-rich thermal baths to racing down white-knuckle flumes. The sauna village comprises brine grottos, loft saunas, red-hot Finnish saunas and an ice-cold plunge pool. For some pampering, pop over to the beauty centre, which offers treatments such as goat-milk wraps and silky smooth hot-chocolate massages.
It's 7km north of Bad Gastein. Frequent services on bus 550 run from the train station to the spa (€2.40, 15 minutes).