This is a little hidden cave in Utah, USA. I went there about 3 years ago – its a national park (like there are so many) that starts with a nice walk along a stunning and beautiful (normal) forest path. However, at the end of the park there is this cave, and if you wanna get in, you have to get your shoes wet a little bit.
Now, having wet shoes is not even the problem, the main issue was that the water was absolutely freezing!! My buddy Luis here (in the picture) was so in pain that at some point he moved as best as possible by jumping across the stones that were lying around throughout the cave.
Little kids walked by and were fine.
Just kidding, they cried like hell as well and parents had to carry them all the way through, hehe.