Húsafell Canyon Baths are a secluded geothermal bathing experience located in a remote canyon in West Iceland. You can only visit as part of a guided tour since it's on private property. It's a short hike down to the baths, and keep in mind you do need to go down stairs to get there.

There's also a cold glacier river nearby for a cold plunge! Since you need to go on a tour to get here and there's only a limited number of people allowed, it's a lot more relaxing than other popular spas or hot springs.

Make sure to book ahead of time :)