The term Ground Zero describes the site of the Twin Towers of the World Trade Center in New York City, destroyed in the terrorist outrage of September 11 2001. However, it was coined much earlier, to describe the center of impact of the first atomic bomb at Hiroshima in 1945, and was also often used for disasters with a geographical epicenter, such as earthquakes.
In New York City, Ground Zero encompasses a square block in downtown Manhattan towards the west side. As of 2010 it is a construction site on which the Freedom Tower and a number of other skyscrapers are being built. It will also contain a memorial center as well as a transportation hub. There is a controversial proposal to also construct a large mosque and muslim community center very near Ground Zero.