Welcome to a world like no other. The ringworld: a landmark engineering achievement, a flat band 3 million times the surface area of earth, encircling a distant star. Home to trillions of inhabitants, not all of which ar...Welcome to a world like no other. The ringworld: a landmark engineering achievement, a flat band 3 million times the surface area of earth, encircling a distant star. Home to trillions of inhabitants, not all of which are human, and host to amazing technological wonders, the ringworld is unique in all of the universe.