It took me some time to ponder about everything, but finally, here's the first draft of my contest entry:
The Blue Fortress
Almost a city itself, the Blue Fortress was built outside the walls of Oreas more than 40 years ago. It's a sign of the Golden Empress' wish to foster the arts and unite the three main pillars of Aurelian culture: Combat, Magic, and Science. Therefore, the Blue Fortress does not only offer arenas, but also podia for speeches and discussions. Oh, and not to forget the amphitheatre crawling up the hill!
Apart from minor events, the city of Oreas hosts a nation-wide contest every three years. It's the most important cultural event designed to bring together people from all over the country in peaceful competition (and therefore minimise the chances of a civil war).
More information will follow as I progress with the map. Of course, it still lacks colour and tags and everything. And this is just the visitor's map. I'm working on a 3D model of the Temple of the Three Ways and perhaps I'll even get round to prepare a real floorplan of one of the buildings.