A bit of googling reveals it's the remains of the brig Athena. The ship ran into trouble during a winter storm in December 1852, while sailing from Alexandria to Liverpool. All 14 crew members were rescued.
Surely everyone remembers the Hungarian phrease book? ("Drop your panties, Sir William, I cannot wait 'til lunchtime.")
Whereas nobody expects the Spanish Inquisition...
Edit:Ah, MoS beat me to it while I was brushing up my Hungarian.
From Oslo one line runs west to Bergen and gives access to the Hardangervidda or Skarvheimen areas e.g. at Finse. Geilo, a couple of stops further east is a town with facilities.
Another line heads north from Oslo to Trondheim, passing through Oslo Gardemoen airport, and then giving access at places like Otta, Dombas, or Oppdal to parks such as the Rondane, Dovrefjell or Trollheimen. There's been some fairly major disruption with bus replacements for extensive engineering work on the southern end of this line, for well over a year now, so check for current info if you're thinking of heading that way.
There are two main bus companies Norway Bus Express and Nettbuss Express
Buses will get you to some of the more western parks, the Jotunheimen or Tafjordfjell for example. They take several hours but are pretty comfortable. Norway Bus Express will certainly get you to Tyin for the southern end of the Jotunheimen. Nettbuss run through Otta and Stryn for access to the northern jotunheimen or southern Tafjordfjell - these services run on to towns on the fjords.
For some options you may need a local bus or else resort to a taxi to get to the starting point for your hike.
There's some more general info on this visitnorway page
Looks like a good trip, Graham. And quite surprising how reasonable the cost of getting there was.
The fact of it being so empty would certainly be appealing, and there's something about those wide-open views and big skies, but I suppose in reality I'm always likely to pick somewhere a bit more mountainous for my nordic ski touring. This year I went back to the Jotunheimen in Norway... I must say you've shamed me - I should try to get round to pulling together a few pics and a write-up.