The Falun Gruva is my favourite WHS in Sweden so far. The site can be visited all year round. After wandering around the pit I took a tour to the underground. There is a tour every day in winter (2 on weekends). Unfortunately mine was in Swedish, so I roughly understood about 10% of the guide's explanations. What you see can be compared to Rammelsberg, but the mine is better accessible with broad footpaths and save stairs. No problem for children and elder travellers.

The WHS includes a few buildings in and around Falun. I visited the non-spectacular church and the village of Gamla Staberg, around 10km from Falun on the way to Engelsberg. The main feature of Gamla Staberg seems to be a huge garden, which wasn't really great as even in late March the country was still covered in snow. By car, Falun makes an easy daytrip from Stockholm. It can be combined with Engelsberg Ironworks.