It is safe to say that the Aqua Dome in Oberlängenfeld is one of the nicer thermal spas out there. You don't have to take (only) my word for it, the facilities have numerous accolades under their belt as being among the best in Europe.
Part of what makes this facility special is its location, which is in the middle of a valley between the Alps. Seriously, you cannot beat the view when you're in any of the outdoor thermal baths. The other part which is great here is how everything is set up, which can be described in one word as "smooth".
Robes and towels are available upon arrival, and any services, additions or food/beverages will automatically be charged to the tile gizmo watch which you're supposed to wear. No need for actual payment upon receipt of your additions, the wrist band keeps track of everything for you and allows you to pay when you're ready to leave.
The facilities itself are beautiful, there are numerous thermal baths with different temperatures, including a salt bath (this is the second out of three floating bowls in the outdoor area). Make sure you read the recommended bathing times and warnings before entering, this is pretty important. Also keep in mind to remove all silver jewelry, it doesn't fair well with the mineral content (specifically sulphur) of the water.
The relaxation lounges are quite nice, with the oversized reclining loungers overlooking the mountains it is easy to relax. If you choose, there is a decently sized solarium available for a nominal charge as well as infrared sauna cabins (included).
For those unfamiliar with European sauna etiquette here's a heads-up; the sauna area at Aqua Dome is a mixed nude zone, no clothing or bathing suits allowed. This (the naked part) is pretty standard, though usually it is not as strict and clothing tends to be optional. AD cuts through all the red tape and just straight up calls it a "textile free zone".
If this isnt for you, fret not. You'll miss out on the different varieties of saunas, but you can still make use of the other facilities. Bathing suits are worn in the thermal baths and other common areas, which are separated from the saunas by a long hallway.
All dressing rooms at Aqua Dome are mixed where men and women share the same areas, but if you prefer there are several small changing stalls available. Showers are separate rooms (with a door) and are separated by male/female. Showers are divided by glass partitions but there's no curtain or door - so again, if you value your privacy and none of this sounds okay.. then this is definitely not the place for you.
I feel like half of this review consists of warnings, but I want to make sure that people are aware of these things before it's "too late" (imagine that surprise, lol!). Most of this information can be found on the website, though it's described rather vague and inconclusive. read more