Sølvgruvene i Kongsberg

Hyttegata 3, 3616 Kongsberg

A mine train 2.3 kilometres into the mountain, then 342 metres below ground in what was Norway's largest silver mine. The journey in is in open carriages and children are given helmets. It stays cool year-round, around six degrees, so bring a jumper even in July. For many children the train itself is the highlight, and the mix of darkness, echoes and a story about people who worked here for 335 years leaves a mark. About an hour and a half from Oslo.