Geneva is known for having a huge number of international organizations and even corporations. But the most famous building in the city is the United Nations headquarters, located in the Nations Square. You have to travel a little bit out of the city center, but it's easily accessible by public transportation, or by tram. Its entrance, with the flags of all member countries, makes the visitor feel like they're in a spy movie or like they're politicians. It's not that it's a particularly pretty place, I mean come on, but it's that it's one of those places that you just have to visit.