The Sanitarium of Bloody Children aka "Bloody Toys".

The place of thousands of rumours and urban legends. Possibly the the most feared place in Finland and assumably the most haunted place in the country.
Be as it may - 20 minutes with google and we knew where to look for it.

As you can easily guess this place has nothing to do with iron. (Either it has nothing to do with sanity or sanitariums.) It just happened to be on our way to explore the iron workshops. This was actually our second visit to the place and the last. A pyromaniac burned the main building to the ground two weeks after our visit.