Bioshock 1 and 2 take place in the underwater city of Rapture, located somewhere in the Atlantic Ocean. Bioshock 3 takes place in three places, New York City, the sky city of Columbia, and Paris. Bioshock series doesn't take place in one specific area, but they bring up the theory of parallel universe, which is what connects the series into one whole story.
Yes there is a Bioshock 2 is a direct sequel, and Bioshock: Infinite is a sequel and at the same time a prequel.
Yes, there are three endings.
It depends on how you dealt with every Little Sister.
You get the Good Ending if you don't harm any little sisters.
You get the Bad Ending if you harvest some of the little sisters.
You get the Worse Ending if you harvest all of the little sisters.
