Löyly Sauna

Löyly is Helsinki's most architecturally significant public sauna — a waterfront building of slatted timber that steps down to the sea like a wooden wave, designed by Avanto Architects and opened in 2016 as part of Helsinki's efforts to make its sauna culture accessible to visitors. Finland has 3.3 million saunas for a population of 5.5 million, and the sauna is not a luxury but a basic component of Finnish life — the word 'sauna' is the only Finnish word in the English language, and the practice (heating to 80°C, throwing water on hot stones to create steam, cooling in the sea or a lake) is the closest thing Finland has to a national religion.

Löyly has three saunas — a wood-burning sauna (the traditional type), a smoke sauna (savusauna, considered the most authentic, where the smoke from the fire fills the room before being vented), and a steam sauna. Between rounds, bathers cool off by swimming in the Baltic Sea directly from the terrace, which in winter means entering water that is barely above freezing — an experience that Finns describe as 'refreshing' and that non-Finns describe using vocabulary that is not suitable for print.

The building itself won the International Architecture Award in 2016, and its timber-clad exterior — designed to weather to silver-grey over time, blending with the maritime environment — has become an architectural landmark on the Hernesaari waterfront. The restaurant and terrace, accessible without using the sauna, serve Finnish cuisine and provide harbour views. Löyly is the public sauna for visitors; for the authentic neighbourhood experience, the older Kotiharjun Sauna in Kallio (operating since 1928, wood-burning, no tourists) is the local choice.