Endlantis
Ph1LzA turned the End into an underwater city: Endlantis. It was built in hardcore mode (one life, zero room for mistakes) in a world Ph1LzA played for more than 5 years. End stone covered in water, glass corridors, underwater gardens and a transport system. When Phil finally died in that world (after 5 years of hardcore), the whole Minecraft community was heartbroken.