Eden has a very substantial basis in truth. Like most things in the bible it was taken from ancient Sumarian texts. E'den was a city of Sumer.
The Sumerian Eden was located in Dilmun, modern day Bahrain. Eden contained the Tigris and Euphrates rivers associated with Sumeria. The word Eden was derived from an old Babylonian name for Mesopotamia, Gan-Eden, the garden of the Middle East. Because those great two rivers watered the rich plains between them, the word Mesopotamia means between the waters.
Enki, the Sumerian water-God and God of wisdom, impregnates Ninhursag, his half-sister. Enki desires a son, but receives a daughter. He them impregnates his daughter, who in turn gives him a daughter. Ninhursag decides to put an end to this immoral procession by sowing eight poisonous plants in the garden. Enki eats of all eight plants and becomes deathly ill. On of Enki's sick organs is the rib. Nin-ti is created to heal Enki. Nin-ti means "she who makes live." It is approximately what Eve means. Nin-ti can also be translated as "the lady of the rib." "Ti" means rib and "to make live."
Most of the bible is taken from their scripts. The flood happened to them ( the one which the bible attached noah to). They also have lots of very controversial text carved into their temple walls that can not be explained rationally. Such as the Sumer king list which lists all the kings ( funnily enough) from ancient sumar.
http://en.wikipedia.org/wiki/Sumerian_king_list
The controversal bit being that some of the kings reigned for 40,000 years. It is a very detailed document though
so it cannot be passed off as untrue. Nor can it be publicly confirmed.
A very interesting people with a VERY INTERESTING history.
Read up on it, it will surprise you.
Lots of Sumer symbolism is used today by the elite. The Masons symbol is Sumer in origin.