Here is a fact most Americans have forgotten: for most of the twentieth century, their swimming pools banned swimsuits. Men and boys at the YMCA, in high school swim class, and at Ivy League swim tests swam nude – required, not optional. The reason your grandfather gave was the filters, and he was partly right.
The Filter Story: The History Behind the Hook
When the Brooklyn YMCA built America’s first recreational indoor pool in 1885, it followed European all-male bathing custom: no suits. The technical logic hardened in the 1920s, when heavy, loosely knit wool swimsuits shed fibers into primitive sand filters – in 1926, the American Public Health Association formally recommended nude male swimming, citing suit fibers and water quality. Chicago’s public schools kept the requirement until 1975; a few until 1980. But the historian Jeff Wiltse, in Contested Waters (2007), traces how the filter argument outlived its engineering truth: nylon arrived in the 1940s, modern filtration and lint catchers followed, and by mid-century “the filters” had become an administrative rationale for all-male routine. The practice ended under four converging forces: the APHA dropped its recommendation in 1962, synthetic swimwear eliminated the hygiene argument, Title IX (1972) forced co-educational pools, and 1970s privacy norms finished it off. Today, zero American public pools permit nude swimming – every state health code mandates swim attire. The tradition the US abandoned is alive elsewhere. This is the definitive worldwide list.
Tier One: The Historic Halls
Yrjönkatu Swimming Hall, Helsinki. The flagship of the genre, and the tradition’s living monument. Finland’s oldest indoor pool (1928, Nordic classicism) reopened in February 2026 after a two-year restoration – and its tradition came back with it. The hall banned swimsuits outright from 1928 until 2001; today swimwear is optional, and nude swimming remains the majority preference. Days are strictly gender-separated: women Mondays, Wednesdays, Fridays and Sundays; men Tuesdays, Thursdays and Saturdays. First floor with the 25m pool costs about 6 euros; the second floor’s wood-heated sauna and private cabins runs 18-22 euros. Full context in our Finland guide.
Germany’s textilfrei evenings. German municipal pools run scheduled nude swim hours under the FKK tradition. Stuttgart’s Art Deco Stadtbad Heslach opens its main hall textile-free Saturdays 19:00-21:00 (mid-September through April). Munich’s 1901 Jugendstil Müller’sches Volksbad opens its small hall for nude swimming after 23:00 during midnight sauna events. Berlin’s Kombibad Seestraße and Stadtbad Mitte run weekly DFK FKK slots, and Berlin’s pools have allowed topless swimming for all genders since 2023 (though Stadtbad Neukölln’s historic FKK sessions are discontinued). Further afield: Siegtalbad Wissen (first Fridays), Tatami Schmölln (Fridays after 21:00), Hamburg’s Holthusenbad on its long sauna nights.
Sweden’s kallbadhus. The historic open-air bathhouses on piers – Ribersborgs in Malmö, Saltsjöbaden near Stockholm – operate separate men’s and women’s wings where nude sea swimming is simply how it has always worked, year-round. See our Sweden guide.
Two honest corrections from our verification: Vienna’s 1926 Amalienbad requires swimwear in its main pool hall (its sauna zone and FKK roof terrace are another matter), and Budapest’s Rudas Baths phased out the traditional apron – proper swimwear is now mandatory even on single-gender days. The historic-bath world is tightening, which makes the working nude halls more valuable.
Tier Two: The Naturist Session Circuit
The other model: ordinary municipal pools, rented or scheduled for naturist sessions – nude-required, co-ed, and open to travelers with a naturist federation card or a pre-booked guest slot. When the beaches close for winter, this is where naturist swimming continues.
France runs the deepest circuit. Paris’s Piscine Roger Le Gall opens its 50m Olympic pool to the Association des Naturistes de Paris on Monday, Wednesday and Friday evenings 21:00-23:00 – suits prohibited, swim caps required, and visitors welcome for about 10 euros before annual membership kicks in (full detail in our Paris guide). Nantes (Piscine de la Durantière, Saturdays 19:00-21:00), Strasbourg’s Bains Municipaux (Tuesdays and Thursdays 20:00-22:00, on a plain public ticket), Lyon’s Piscine Garibaldi (Mondays), Halluin near Lille, Argenton-sur-Creuse, and periodic events in Angers complete the map – see our France guide.
Spain. Barcelona’s Olympic Bernat Picornell pool on Montjuïc hosts nude-required sessions Saturdays 21:00-23:00 (Sundays 16:15-18:00 in winter) with plain public entry – covered in our Barcelona guide. Madrid runs seasonal naturist days at municipal pools (Casa de Campo’s Lago in June, Peñuelas’ “Día Sin Bañador” in July), and Bilbao’s Artxanda hosts winter Sunday evening sessions.
The Low Countries and Nordics. The Netherlands runs weekly naturist swims at Zwembad Groenoord in Schiedam (Wednesdays), plus monthly sessions at Amsterdam’s Mirandabad and Sloterparkbad and bi-weekly slots in Utrecht. Belgium’s FBN hires full aquatic centers for its swim events in Gent, Sint-Truiden and Mol. Denmark’s Danske Naturister stage regular nøgensvømning evenings at Frederiksberg Svømmehal in Copenhagen and municipal pools in Korsør and Børkop – family-welcome, about 50-100 DKK at the door. See our Denmark guide.
The United Kingdom. British Naturism’s club circuit rents leisure-centre pools year-round: the Northgate Arena in Chester (Sundays), Dover Leisure Centre (Sundays – a swim club running continuously for over 45 years), monthly events in Southampton, bi-weekly swims in Edwinstowe, Sunday afternoons in Desford, and a male-only session in Manchester. BN and INF cardholders walk in; guests pre-book with ID.
Canada, Australia and New Zealand. Quebec’s FQN winter program runs September to May: bi-weekly Saturday evening swims at Repentigny and Sainte-Julie near Montreal, monthly sessions in Quebec City – see our Quebec guide. Melbourne’s CosieVic events rent municipal pools monthly (15-25 AUD), Sydney’s clubs hire aquatic centers in the cooler months, and New Zealand’s clubs rent indoor pools in Auckland and Wellington through the southern winter.
Etiquette and Practical Notes
- Towel always, photography never. The standard naturist rules apply with extra force in municipal buildings – staffed pools mean zero tolerance for either.
- Shower first. Nordic halls mandate a soaped nude shower before entering the water; French sessions require swim caps. Local rules are posted – read them.
- Arrive inside the entry window. Sessions lock the door after opening (Roger Le Gall’s desk closes 30-45 minutes in). Miss the window, miss the swim.
- Membership reciprocity. FFN, INF, BN, FQN, DFK and NZNF cards smooth entry almost everywhere on this list – traveling naturists should carry one.
- Seasonality is inverted. Most circuit sessions run September through May: pool season is the northern winter, which makes this list the naturist answer to cold weather.
The pool tradition is, in the end, the same story everywhere: the places that kept it treat it as normal, and the places that lost it find the memory hard to believe. For where the swimsuit-optional world extends beyond the pool, see our guide to the world’s most naturist-friendly countries and the Nude Travel Resort Directory.
Where to Stay in Helsinki
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Helsinki (HEL) is the gateway for the Yrjonkatu flagship. Compare fares via Kayak
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