I'd love to stay in any of the ground level ones but not the gravity-defying ones. Not so much scared of heights as depths Isn't there a hotel built of ice somewhere in the Arctic Circle? Joanna Lumley stayed there trying to see the Northern Lights.
There are several ice hotels now but the first and the best is the one in northern Sweden. I know quite a few people who have stayed there as my project team in Stockholm went for a weekend, unfortunately I had to be in Southern Hungary at the time on another project so I missed out and then ended up coming back from Sweden before they rebuilt it the next winter.