The lost soundtrack from the prototype build of Assassin's Creed Brotherhood.
You can also see some out of bounds secret locations.

00:00 Intro
00:12 E3_BrotherhoodLogo_Bink
00:41 E3_Flight_Cinematic2_v2
01:18 GamesCom_EndDemoCamera
01:44 SQ01M04_Being_OverRun
02:19 TitleScreen_Vatican_Hallway_2010_Remix
04:33 OpenConflict_Escape_Combat_Full (mute for copyright)
   • Assassin's Creed Brotherhood (Unused ...  
06:25 Exp_Downtown_Main_lyr1 (mute for copyright)
   • Assassin's Creed Brotherhood (Unused ...  
11:36 ComicCom_Menu_Music (mute for copyright)