The series by Sir Terry Pratchett is pretty old; it started in 1983, ended in 2015, and has over 40 novels. The popular comedy fantasy takes place in a world that’s flat and rests on the backs of four elephants that stand on a giant turtle’s shell, as the turtle swims through space. It’s amazing.
The series breaks off into mini-series that cover various facets. Discworld includes the series that looks at the city’s police force, the series on wizards, the self-explanatory series, and a series on (its personification). The series is a comprehensive exploration into a world that’s similar to ours, yet so far apart.