Although the writers never mentioned where the island came from,there's a complete theory saying that it can be traced back to the era of Atlantis,evidence like richard living on the Tenerife which originally belongs to Atlantis and the temple looking the same as North America Pyramid.

Before Walt was rescued,the black woman said the others had learned sth from him,I guess it refers to the ability to teleport,there's a theory that each leader of the others is chosen from candidates having special gift( young Ben could see his ghost mother,baby Locke drew a picture of a man brought to a trial by…