ArenaNet's "Living World" concept was meant to maintain an appearance of a rapidly evolving and continuously changing game world. After the launch of the base game, biweekly patches of varying size and scope brought new content into the game, continuing for nearly two years until the spring of 2014. This content was not designed to be repeatable, with the added content only being accessible until the next living world patch. The content is now mostly inaccessible, though some instanced content and permanent changes to the game world remain. As the story content of these patches is no longer playable, a cinematic has been created to convey its story to new players. One of the most notable changes brought by this series of patches was the destruction of Lion's Arch, one of the game's major cities. The old version of the city can still be seen in base game personal story instances, which take place before the city's destruction.