There are private sauna's much older than what your family owns too. 😂 But Rajaportti is the oldest surviving puplic sauna. My father painted the buildings and did radiation repairs to the buildings some years ago. Due to how the land is formed in the spot where the sauna is located, the radiation levels are much higher. The red building on the property had levels of about 18 000 before the repair, when the allowed level is around 600/800. This is all from the naturally built up radiation. With the repair of the "radiation well system" which redirects the radiation, the levels were at a much lower level. It's recommended that locals who live on Pyynikinharju for a long time take extra cancer tests, as their risk of getting it is slightly elevated. It's not dangerous to live there though, but locals have to take that into consideration, especially if their house hasn't taken radiation into consideration. Pyynikinharju is the largest of its type on the whole planet, rising 85m from Pyhäjärvi and 162m from sea level. My relatives on my fathers side also founded, owned and kept the Malt Factory before it got sold and burned.