Oslo is often called one of the greenest cities in the world, and I’ve had the chance to visit it twice. So, I’d like to share feedback on whether that title is truly deserved.One of the places that stood out to me in the city center was the Oslo Opera House. It’s built in this super modern and minimalistic style, and what’s cool is that it’s right by the fjord — like, you can sit on the steps and dangle your feet over the water, or you can walk up the roof. No ticket, no fuss.