Swiss architects Herzog & de Meuron know how to keep it real. They're building the Naturbad Riehen pool (translating to natural bath), an "outdoor bathing lake," that will be filled with all natural water and not treated with any chemicals or chlorine. The design hopes to accommodate around 200 bathers a day and will rely solely on natural filtration. Keep on the lookout for Riehen, Switzerland in 2014 when this pool is finished and open to the public.

[via Dezeen]