World Map
The World Map is filled with things waiting to be discovered. Every point of interest on the map is marked with a '?' symbol, and may turn out to be either a Modifier or a Treasure Chest. Both are very rewarding.
Modifiers are special types of objects that change the rules of the game (for example: by allowing you to move every building in your settlement, or by blocking your ability to trade). To take on a Modifier, simply settle on a map tile adjacent to it. After winning a game near it, the Modifier will disappear, and you will be rewarded with additional Citadel Resources.
Treasure Chests, on the other hand, don't require you to settle near them to claim their contents. Once you discover a chest, simply select it on the World Map to open it. A chest must be within your Embark Range to be collected.