Fabrikkgata, Oslo Norway
Colosseum is one big building which has skatespots all around it. According to what I've seen of the spot, it is divided into two parts: One part is where there are around 3 stairs. The staircases are divided by a black ledges which you can grind on. The black ledges aren't like normal curbs, but more like steep banks. You can grind the edge. It's hard to describe. You can go to rollingmag.com to see pictures of this spot. Another part is a bunch of white marble curbs in different heights.
Colosseum is a must see if you're in Oslo on a skatetrip.
Majorstua t-bane station. Go to the center of the city, and ask for Colosseum Park.