There is that point here where you just crossing the Arctic Circle line, so you can stop over and take a photo as a souvenir. There is also coffee house here and of course, souvenir store
There are endless places to visit and see here, I am not an expert so I only give few links and you can just go and search, you will find a lot.
Norrbotten Official Abisko National Park Abisko National Park by VT member dave_21 National parks in Lappland, Norrbotten and V?sterbotten Natural Parks in Sweden The Swedish Environmental Protection Agency