Where is the center of the world?

The center of the world also known as the inner core is located exactly in the middle of the earth. However, at this current time or the forseeable future we stand no chance of getting near it due to its extremely high temperatures.

-There are various ways to explain the "center of the world" do you mean the Core of the Earth? well look at the answer above. If you mean like half way across the world, the Equator, then that would be most likely considered to be Quito, Pichincha, Ecuador. (its like City, State(Providence), Country).

If you mean Vertically then, there are infinity possibilities.