Löyly is a 1800m2 sauna complex in Hernesaari Helsinki built completely of wood. You can either reserve own souna for your group use the public option.
From the outside Löyly is not a typical finnish sauna, but the architecture is pretty interesting. From the inside the saunas are still close to the typical Finnish ones with wood heated stoves.
Don´t miss the smoke sauna, a special type of sauna without chimney where you will sit in the smoke.
Bus #14 will take you right next to Löyly. You can take it for example from Kamppi.
Tram #3 is the closest of trams but you will have to walk 1,4km from the nearest stop.
Adults 2 hours: 19€
Children under 10: Free with adults