End City is a structure that rarely generated in the End, but can be found quicker using this seed. It's a place where you can find many valuable items: enchanted armor, weapons and Elytra wings.
How to find: Build a standart Ender Portal, go into The End and use Creative mode to fly out of the cave and move into the direction imaged on the screenshot below, it will take some time before you will see the silueth of the island where End City is located.
Seed: 57857190