25The Heart Of Liberty City (GTA IV)
Grand Theft Auto IV is a game rife with secrets, but akin to its successor there are some secrets that are best left undiscovered due to their sheer creepiness. The Statue of Happiness (which is inspired by the Statue of Liberty, in case that wasn't clear enough) seems tame enough, but
a closer inspection reveals a pretty dark secret.
In order to land on the platform which houses the entry to this secret, you need to jump from a plane/helicopter, or make a well-timed landing from a parachute. You'll come across a door that boldly states, 'no hidden content in here.' So obviously, you walk through the (fake) door, climb up a tall ladder... and witness one of the most disturbing sights ever in the form of a massive living, beating heart bound by chains.