In the past, Medvednica Mountain was an important treasure of natural resources for the people of Zagreb, so they also dug deep in it, searching for precious metals. After the discovery of galena ore, a source of silver, a mine was opened in the 16^th century. The hardworking miners dug and dug painstakingly, but the mine was simply not productive enough, and closed down the following century. After a few hundred years of silence, these dark and cold tunnels are now accessible to curious visitors in search of a special experience.