Fly a copter to the statue of happiness. Jump out of the copter so you land on the highest area with doors. One of the 4 doors will have blood stains on the floor in front of it and 2 signs on either side saying "no hidden content through here". That "door" is actually NOT SOLID. so walk through it to find a ladder. climb the ladder, and you will be face to face with the beating heart of the city! If you shoot it blood will come out.