Lähteen sauna

https://lapinlahdenlahde.fi/sauna/

The sauna, originally built in the 1880's, was used by the hospital staff and patients in the early days. The sea shore and the magnifique surroundings of the former hospital area offer a unique sauna experience in Helsinki.

The mixed sauna hours open to public are Thursdays and Sundays. It is also possible to book the sauna for private use outside the regular opening hours.