The Green Frog Spa "The unique functionalist Green Frog swimming pool in Trenčianske Teplice was designed in the 1930s by architect Bohuslav Fuchs. The swimming pool is nestled in a forest, relatively high above the city on the southern slope of the Teplice Highlands."
17. novembra 297/15, 914 51 Trenčianske Teplice, Slovakia
The place fell to a state of decay that I'm surprised it came back from.
Apparently the original pool was filled with thermal spring water, not anymore.