Eden

Eden or the Garden of Eden was a place where the people of the First Civilization were known to exist. They were an advanced race of beings, and created humanity, whom they enslaved using technology later known as the Pieces of Eden in order to build and expand their civilization, by using them as a docile workforce. The mountain behind Eden bears a strong resemblance to that of Mount Kilimanjaro in East Africa, which may be where the location of the city resided.
Eden was the place where the first recorded act of human liberty was performed, and was possibly the site of the foundation of the Assassin Order.
Adam and Eve were believed to have been the first humans capable of resisting the power of the artifacts, presumably being devoid of the neuro-transmitter that humanity had built into them by the First Civilization. This neuro-transmitter was the trigger that forced humans to respond to the will of the Pieces of Eden. Adam and Eve were known to have escaped the compound through freerunning, along with an artifact later known as the Apple of Eden, which they seeming stole from a First Civilization being using it to control humans within the city. During his time as Animus Subject 16, Clay Kaczmarek obtained a video of the escape of Adam and Eve from Eden, which he split into twenty pieces and left within the Animus for Desmond Miles to find.
Gallery
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Humans being controlled in Eden.
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Adam and Eve with an "apple", a piece of Eden.
Source