The communal bathhouse has quietly become one of New York's most fashionable outings — part wellness ritual, part social club. The old-school 'shvitz' has been replaced by a wave of design-led spa destinations where saunas, steam rooms and cold plunges come with moody lighting, serious architecture and a clientele that might include a hedge-fund manager two stools over.

The appeal isn't hard to unpack. Heat and cold therapy have gone mainstream, and the bathhouse offers something increasingly rare in Manhattan: a place with nothing to optimise. Watches come off, phones stay in lockers, and for a couple of hours nobody is chasing an inbox.

A handful of venues define the scene. QC Spa NY on Governors Island is the full-scale option — multiple saunas, steam rooms, outdoor pools and hydrotherapy, all framed by views of the Manhattan skyline. Bathhouse Flatiron, designed by the Rockwell Group, sits closer to the office grind, with thermal pools, two large saunas, a steam room and treatment rooms, plus theatrical aufguss rituals where essential oils are wafted through the sauna air. For something quieter, AIRE Ancient Baths on the Upper East Side caps occupancy at just 15 guests inside a former MoMA warehouse, complete with thermal pools and a suspended flotarium. And if you like your sweating social, Othership Flatiron runs a 90-person performance sauna with guided sessions pairing music and breathwork, alongside more relaxed free-form sessions.

First-timers shouldn't be intimidated by etiquette. Priit Kallas, CEO of Estonian sauna maker Iglucraft, points out that norms vary widely between countries and even venues — some require swimwear, others treat nudity as perfectly normal, especially in single-sex spaces. His advice: check ahead and follow the lead of those around you. Saunas aren't temples of silence either; in Estonia they've always been places for conversation, just at a considerate volume.

A few basics travel everywhere. Sit on a towel (venues provide them), leave phones and cameras outside, keep food and alcohol away, and don't treat enduring the hottest room as a competition. Even unfamiliar rituals — like the Finnish and Estonian practice of gently whisking skin with water-soaked birch or juniper bundles — are best met with curiosity rather than alarm. The guiding principle, Kallas says, is respect for the space, the people and the tradition, whether you're in a rural Estonian smoke sauna or an expensive Manhattan one.

For travellers, this is a genuinely good way to spend a New York morning or evening. It's a break from the usual itineraries, a shot of recovery after a day of walking the city, and a peek at how locals actually unwind. Book ahead — the smaller venues fill fast.