I learned about it last week; it's delightful. A close friend is half Czech, so I often end up sharing with her cool stuff I learn about Czechia, and this was one of them.

Something that's been cool about this is that before I knew of her Czech heritage, I knew very little about Czechia. I've realised that whenever I stumbled across cool facts about the place or people, my brain didn't have anything concrete to attach it to, so it'd just end up in a nebulous blob of Eastern European-ness, and would more readily be forgotten. A lot of what I've learned over the last year or so has mostly been because if I stumble across something cool, like this dam, then my brain now goes "ooh, this is cool, I should tell my friend about this". She acts like a sort of semantic anchor in my mind, and that's really cool