This is a very unusual site - a major ironworks and one of the first industrial production sites in the world, yet it has a pretty idyllic location in the midst of a Swedish forest. Everything here is perfectly preserved, and there are guided tours (with English audioguides) to show you around. The complex of Engelsberg Bruk (also spelled "Ängelsberg" locally) not only includes the industrial buildings used for iron making, but also workers' residences and the manor of the owner's family. Visiting the site by public transport is a bit tricky, but manageable - Ängelsberg is on the regional train line between Västeras and Ludvika (with connections to Falun). From the station it is about a 25-minute walk to the site (the local tourist office is located along the way, and the staff there were friendly enough to let me store my suitcase there).