What is Vienna and Oslo?

It is unknown, but some argue that it is put together from two old norwegian words; OS - river delta and LO - possibly an old name for one of the rivers running thru Oslo. This is however much debated

Oslo is a city, thus it is always capitalized.

I would catch a flight, as trains don't run from the US to Oslo...

There aren't that many things to do in Oslo, but there are some: The Nobel Prizs Peace Center: Norway is the country that gives out the Nobel Peace Prize, and the center is located central in Oslo...

Vienna is the capitol of Austria where composers like Mozart, Beethoven, Schubert, etc. lived and worked.