They are shown briefly during a cutscene in Sequence 9, when Ezio communes with Desmond through the Animus. You won't find any spoilers here, go play the game.
It is a video of Adam and Eve from the book of Genisis stealing the "Apple of Eden"
When you complete all the glyph puzzles, it gives you a video of Adam and Eve climbing up a futuristic building even for our time. At the end Eve turns to Adam and says, "Adam, I have the apple." she is holding the piece of eden in her hand.
The correlating mythic scenes contain Adam and Eve. http://en.wikipedia.org/wiki/Adam_and_Eve
The video that is unlocked shows Adam and Eve escaping from... ... Somewhere. But I think they might be escaping a crime scene where they just stole the apple of eden, as this is also pictured
not sure exactly but I think it showed the legacy of the assassins from where it all started which the video shows Adam and Eve running from what could be "those who came before" and they climb up a futuristic looking building which appears to be holding in people who are doing slave work and at the end it then shows Eve holding the Apple of Eden that you find in the game
jack
If you are on about the religious side of it (adam and eve) then it all depends on what you believe in. if your talking about how Ezio can free run, then many of the free running aspects (Like jumping off the top of a building into a haystack) are physicaly impossible.
Adam and Eve were created by Jehovah (God).
There are three movies that deal directly with Adam and Eve; they are The Bible: In The Beginning, The Sin of Adam And Eve and The Creation: Adam And Eve. There are several movies that have excerpts of the story of Adam and Eve but they are only reference points.
Adam and Eve had to do everything alone.
The historical position is that neither Noah nor Adam and Eve actually existed. The biblical position is that Noah was after Adam and Eve.
No Adam and Eve were not there by accident, they were created by god, Adam from the clay and Eve from one of Adams rib.