Minecraft wiki entry for Defeating_an_End_city, associated text: End cities are special structures found in the End. They are highly anticipated to explore, because they are inhabited by shulkers, and are the only place where you can find elytra, an extremely useful set of wings that you can use to fly. Since elytra can only be found here, end cities are a great place to go before going on long journeys. Players would go to the end to loot the end cities; this act is nicknamed 'End Busting'.