During the short Swiss summer, Zürich residents swap suits for swimming costumes and plunge into the cooling waters of Lake Zürich and the River Limmat. More than 25 badis (public swimming baths) line the lakeshore and riverbanks, from streetwise hangouts like Flussbad Oberer Letten, where the hot, young and hip come to cool down, to the elegant Frauenbadi, a graceful women-only bathing pool founded in 1888.