The Magna Carta is a wonder in Civilization Revolution. This wonder can be built when the player discovers Democracy and its benefit is that all the Courthouses built in the player's cities also produce culture as well as their usual benefit. This wonder's effect is also never canceled. Note that this wonder is the earliest wonder you can build that has a continuous benefit that does not expire. For this reason, it is quite a worthwhile use of resources, as it will give you a benefit for a large chunk of the game - usually around 150+ turns.