3. The Happiness Heart
While we are still on open world games, the Grand Theft Auto series is renowned for the secrets it let's it's player hunt down. The biggest, and arguably most mind blowing is in GTA IV. You need to head on over to The Statue Of Happiness, on Happiness Island - the in game parody of The Statue Of Liberty. When you hit the front door to try and get in, you met by a sign saying "No Hidden Content This Way", much like the sign at the top of the Gant Bridge in San Andreas. However, this time there is something secret and something huge. Head on inside, climb the ladder and behold a giant beating heart, chained to the walls of the statue. Creepy! It just goes to show the twisted sense of humour that the guys at rockstar have. FUN FACT! Take too many shots as Luis in The Ballad Of Gay Tony and you wake up inside the statue, staring at the heart. Worst hangover ever.