Ringworld

Ringworld is a series of science fiction novels written by Larry Niven, and part of his Tales of Known Space universe. The first four books in the Fleet of Worlds series are a prequel to the Ringworld series; the fifth book Fate of Worlds: Return from the Ringworld is a sequel and serves as a conclusion for both series. • Ringworld (1970) • The Ringworld Engineers (1979) • The Ringworld Throne (1996) • Ringworld's Children (2004) • Fate of Worlds (2012) —this book serves as a conclusion to both the Fleet of Worlds and Ringworld series Companion book: • Guide to Larry Niven's Ringworld (1994, with Kevin Stein) https://en.wikipedia.org/wiki/Ringworld_series