From the introduction:
The goal of The Zone is to immerse yourself in an imaginary situation.
You start alone. Pick a real-life Location, preferably an area in the centre of the city. The more familiar the Location, the better. You will have to be physically present at the Location during the game.
The aim of the game is to imagine Location long after an Event, which made the human population disappear and the Location abandoned — left to the nature and its own ways. Event could be the fall of a nuclear bomb, outbreak of a deadly virus, migration of the human population to the stars, or something else entirely.