Zurich, Switzerland – Zurich has 18 official outdoor bathing spots, all offering crystal-clear water in stunning surroundings.
Stockholm – When the summer sun shines on the Swedish capital, locals grab their swimsuits. The archipelago city has plenty of pretty beaches and secluded coves.
Hong Kong – Sticky, humid summers mean swimming is almost a necessity in Hong Kong. The W is just one of the city hotels offering a classy way to cool down.
Copenhagen – Surrounded by water, Copenhagen is a joy for swimmers when midsummer banishes winter gloom.
Lisbon – Vast stretches of sand and turquoise waters can be found east of the Portuguese capital.
Paris – The Molitor was once Paris's most popular swimming baths. Now it's one of the city's hottest hotels.
Vancouver, Canada – Outdoorsy Vancouver is one of the best cities in Canada for taking to the water.
Sydney, Australia – Swimmers should swerve the surfers at Bondi and instead make for 350-meter-long Clovelly Bay.
Berlin – It may be miles from the sea, but the German capital has no shortage of glorious freshwater beaches.
Rio de Janiero, Brazil – Olympic-sized beaches like Rio's Copacabana and Ipanema offer some of the best views to be found on the water.
London – Seemingly perpetual gray skies make London an unlikely swimming destination. But when the sun shines, it offers some surprising opportunities for soaking.
New York – The vast 50-meter pool at Astoria Park is a popular cooling-off option in the heat of a New York summer.