I read the Wiki summary. That's quite a story.
The author, Larry Niven, liked the idea so much he wrote EIGHT more books about it!
I think I only read the first two, "Ringworld" and "Ringworld Engineers". The second one was in part inspired by an anecdote Niven cited, some engineering convention, a bunch of engineers started chanting, "the Ringworld is Unstable". :^) Geeks. The rest of the novels may be related the Kzin, the ferocious sentient (well, half-sentient) species of cats. His original ringworld concept grew out of the notion of Dyson's Sphere.
Whoa, that's a pretty good Wikipedia page! I've rarely read fiction since, well, since reading those first two Ringworld novels (I read the first one in 1984, borrowing it from a brother-in-law). If you opt to read 'em, you're in for a treat, they're really quite funny, and I have fond memories of the quite imaginary Teela Brown, and "the luck of Teela Brown!" Niven had a knack for making the ridiculous made-up crap common to sci-fi seem plausible via misdirection and humor.