The BioShock franchise is well-regarded for its combination of complex, in-depth narratives with exploratory first-person shooter mechanics. The franchise comprises three titles: the original BioShock and BioShock 2 both take place in the underwater city of Rapture, while the third and most recent installment, BioShock Infinite, takes place in Columbia, a flying city high up in the clouds.
Source：https://www.cbr.com/important-bioshock-lore/
