
(Photo by Thermae Grimbergen)
Thermae Grimbergen is in the outskirts of Brussels, I chose it as an affordable hotel for my business trip. The Thermae looked like a regular hotel, and a small spa, split among multiple buildings. The entrance to the spa was downstairs past the reception in the main building, and I expected a usual basement spa experience. But, it turned out that the buildings were just a front to what was hidden behind: a lush garden with a pond, more than a dozen different saunas and endless relaxation spaces. You wouldn't think the city exists outside the garden.
The opening photo above is of the pond on the center of the garden in the spa. Water was quite nice, when I tried in the darkness of the evening.
The spa is independent of the hotel, anyone can visit the spa, and hotel guests also pay an entrance fee unless it is part of the package they signed up to. The entrance fees are quite reasonable, 34.90 or 32.90€ on weekends or weekdays, but if you enter after 5pm you get a 50% discount, leaving just a bit over 16 €. This is a bargain! And I didn't have a chance to visit during the day anyway, as I was in meetings in Brussels and coming back late in the evenings.
There's two parts in the spa, the naked "Aquarius" side and the swimsuit side, "Sabai". Note that shorts -type swimming pants are not allowed on the Saibai side, men get your speedos ready :-)
The Sabai side has two traditional saunas, one infrared, and one steam bath. There is an indoor-outdoor relaxation pool and two outdoor pools, plunge pools and a floating pool. Read more about the swimsuit side here.
The Aquarius side is larger, there's a total of ten saunas:
- The Celestite sauna
- The African Lodge sauna
- The Tibetan sauna
- The Kelosauna (built on kelos, naturally dried logs that are commonly used in the Finnish Lapland)
- Wood sSove sauna
- Herbal sauna
- Black Forest sauna
- Roman steam bath
- Cold sauna
- Tepidarium
My personal favorites were the Kelosauna and the Black Forest sauna. Both are also near the pond, which you can also dip into. But I probably liked them most for their closeness to the Finnish sauna experience which I'm so used to. Dry but hot... wood rather than tiles... and close to the nature. The Kelosauna is massive, could hold dozens and dozens of people. But late in the night I got it all to myself :-)
There's also a champagne bath (a jacuzzi), another jacuzzi, and an indoor-outdoor swimming pool.
Read more about the Aquarius side here.
Thermae Grimbergen is 11.7 kilometers from the airport to the west, and also 11.7 kilometers from the city center to the north. It is located in the countryside village of Grimbergen, a nice village with a definite medieval twist. Roads passed through the area already in Roman times, and the first fort was built in the 8th century.
All in all, much recommended place to visit! I only wish I had more time to enjoy it -- need to come next time on a tourist trip and stay the full day, get relaxed :-)
More photos of the Thermae below.
First the hotel part. Here is where I stayed in, one of the hotel buildings, this one being on the street:
And this is the nightly view of the spa entrance itself (which is in a different building):
And in daylight:
Here's the kelosauna that I liked a lot, but all saunas were good:
(Photo by Thermae Grimbergen)
(Photo by Thermae Grimbergen)
And a view from my hotel room (this is a different pond than the one we swim in the spa):
For more sauna and swimming stories, check out planetswimmer.com and saunablogger.cool websites! And of course the Planetcaver, and Planetskier blogs for other stories in Blogspot and TGR! The photos and text (c) 2025 by Jari Arkko. All rights reserved. I never take photos of saunagoers or swimmers, all photos are taken when the facility is closed or empty, or photos are provided by the facility. In this case, Thermae Grimbergen has graciously provided the photos 1, 5, and 6 above.