Tytyri Adventure Mine is located in an old limestone mine in Lohja. At a depth of nearly 100 meters, visitors can explore the history of mining, a geological exhibition, and underground art. You can visit on your own during the mine’s opening hours or take a guided tour. The Troll Cave is closed for maintenance until October 7, 2026, and Rönni the Troll will not be available to meet visitors during that time. This revised visiting period covers a typical fall week before the fall break; the closure of the themed cave does not mean that the entire mining museum is closed.