My brother just found a hilarious glitch in Rome, he went climbing up a door to try and get to the top of the building, but there was a wooden platform or awning that was in the way, it was long so he couldn't hop back and grab on to it, so instead, Ezio hops off the door and to the side, i thought he was grabbing onto some other part of the wooden thing above him, but apparently, he kept gliding along through the air until he hit a building, then he stops and starts to FLY, into the AIR! SUPER EZIO, AWAAAAY!
After a while of floating into space, you could see ALL of the districts in Rome almost all at once, and the skybox at the other end of Rome was only just starting to fade away at this point, so this game has a very high draw distance, it looked so pretty at night with all the lights on, but then it went to day time as he continued flying into the air, we thought he would be de-synchronized after going outside the map's boundaries according to the map, apparently not, so the only way to get back was to quit and go back into the game
Best glitch EVER