The Capital City is the main hub of the game which was added in a 2012 update. This is where you can choose between 5 different maps at a time. This is also where you can build the 3 types of building paths. (Military, Industry, and Farming) These give you rewards which can be used in the game, either for your settlement or Capital City. It is persistent between maps. You can also place Decorative Items here, including the Grandfather Clock which gives you unlimited Turns. This particular Item costs 90 Diamonds. You can't remove anything from the Capital City without using a Crane.