Disappearance

What would our surroundings be like if we were we to just disappear? How would we be able to tell that things were not quite right and that for some unknown reason people have just upped and gone without seeing the reason for ourselves? Looking around the surroundings we are able to see from the objects and the moment in time that has been left to pass hours after the event. Time still goes on but the people no longer remain. There was once the presence of humanity but that is only seen by us the viewer who are searching in the dark to find clues to the event looking for why and where the people have gone.